First off, there is no reason to ignore the war Campaign, you need to do them to unlock world quest. Beside that, the way scaling works, war campaigns are easyer to do while leveling then at 120. Everything becomes alittel harder at 120, untill you get some gear, because of them scaling levels. Also, i did my leveling on a demon hunter in about 8-9 hours. I think i know what youtube video you talked about, and i strongly dissagree with him. One thing tho, total xp needed was buffed with 15% that in worse case would make me take 10hours, the way i did it.

Gold for riding training. Travel time is a SIGNIFICANT time sink while using quests to level. You don't want to wait to get it. In fact, while questing, the second you ding 40/60/70/80 you'll want to hearth and train it IMMEDIATELY! 10304 gold is the base cost, which will be modified by reputation. Also, make sure you're in a guild with the 10% riding speed bonus unless you're a class that already gets a mount-speed buff.
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Even though the guide was developed with a hunter, the guide can be followed by any class.  Except you have to do your class's quests which aren't a whole lot.  I do have full intention to make my guide friendly with all classes in the future by listing all of their steps as well.  There will be a toggle that allows you to show which class's steps you want to see in the guide.  But this is coming later.
The problem with using your gold to pay other players to do WoW’s busy work is that you have to get the gold to pay them, and the way you get gold is mostly busy work. Many WoW players just want to buy their gold from other players with cash — preferably, amounts of cash that are fairly trivial relative to the perceived value of the time and effort required to obtain the gold legitimately.
Most of the time you spend leveling will involve questing and slaying monsters, but there’s also a lot of travel. Travel earns you little experience (you do gain a bit for discovering new areas), so it’s wise to keep travel to a minimum. The new level scaling system, which scales zones to your level within a preset range, helps with that. You can choose what zones you want to experience and stick with them until you finish their quests.
 ":"  -  Any time a step ends in a ":" instead of a "." means that the next step is part of the current step you are on.  This generally means the next step should be done while working on the current step.  This means every "start working on" or "continue working on" will end in a ":".  But this is used with other occasions as well, so keep this in mind.
Drustvar is far and away the hardest Alliance zone, which is exactly why you want to do it first. If you have legendary items, they’ll still be usable, and if you don’t, this zone will still be easier early on than it will be later. Drustvar is also extremely fast and will let you jump out ahead of your competition in other zones, which means fewer players around to take your quest objectives.
If you are just coming out of Level 110, you will probably have a number of different Legendary items to choose from. Your Legendaries' special effects will stop working at Level 116, but until then they can be a very powerful addition to help you level quickly. These are our Legendary recommendations for leveling as an Unholy Death Knight in Battle for Azeroth.
If you queue as a healer - take care to always have a stack of water of appropriate level. You can buy it at an innkeeper for next to nothing, but remember that it will become too low-lvl for you very fast, so you need to buy new water every 10-20 levels. Alternatively, you can buy a stack of every tier of water in Stormwind, and just always carry it with you. Another alternative, if you see a mage - always ask him (politely) to create a table for you. Grab 2-3 stacks so you have extra for the next runs.  
With the excitement of becoming Level 120 comes a lot of new activities to do. However, it is particularly important to note that you should continue to complete the story mode quests. You will undoubtedly achieve Level 120 before completing your third zone, so be sure to head back and finish the story quests as they are important to unlocking game content as well as pushing your reputation levels even higher. Each zone comes with a lot of side quests that can be ignored at first as you push your item level up, complete emissaries, and do dungeons, but when you have some time, be sure to wrap up all of the quest lines in each zone to maximize your reputation potential. Reputation is the gateway to all things in Battle for Azeroth, so quest away! Be sure to use our Quest Completion Checker tool here at Icy Veins to see if there are any missed quests in any of the zones for you to go back and complete!

Lastly: The zone order I recommend for Horde is Vol’dun- Zuldazar- Nazmir. Vol’dun is definitely the most challenging of the bunch and having the use of your Legion gear and leggos will smooth this zone out. Nazmir is the easiest of the bunch which is nice when things start to get a little grindy past 116. For Alliance, I recommend Drustvar- TS- Stormsong. Same logic as the Horde side, in my opinion Drustvar is the hardest and Stormsong is the easiest for when it gets grindy. I would recommend you waiting to do any of the War Campaign until you are capped because it just takes you out of the way. I also recommend not killing a single rare mob or picking up a single treasure because in my experience it is just not even remotely worth it. The gear scales up on the rare mobs so its smarter to keep them till 120 anyways. After you are done leveling, I do recommend taking the time to do all the quest at the Faction Outpost in your enemy territory. They do provide rep for the Honorbound which helps. Most of them are quite easy. If you do not level in Warmode, you will usually hit 114 from your first zone, 117 from your second, and cap 120 about 2/3 in your final zone.
So, the initial leveling process is probably the longest it has been in an expansion in a long time. My first play through, it took me about 12 hours to finish every single quest in every single zone. Needless to say, due to leveling 7 times, my last leveling was done by a ret pally and took me just over 8 hours and completed every quest in the Horde zones. There are a few tips I would like to give for leveling in BFA.
Fish, meanwhile, were significantly devalued by the Underlight Angler, an artifact-quality Legion fishing pole that made fishing so productive that a very small number of fishermen could supply an entire server with materials for cooking. At current rates, fishing in Battle for Azeroth is more time-consuming, which means less food to go around, and higher prices at the auction house. Of course, Blizzard could change spawn rates in a future patch, but as of now, signs point to an economy in which common necessities will be much more scarce.
This whole affair has caused myriad arguments with the community, with some old-timers noting that the time-to-level increase is a joke compared to Vanilla, and newcomers sharing their point of view that World of Warcraft is slower than a lot of other games on the market. I can certainly understand both mentalities, but given that the leveling system is sort of a token process now and is already frustrating for a lot of players -- seeing it shaken up this much can't be good for the game.
Gold-making blog Just My Two Copper suggests that enchanting will be quite the money making profession during the initial phase of Patch 5.3. This is because with players racking up new shield heirloom items and new PvP weapons and cloaks, and the tendency of PvP fans to max out every potential stat in their gear to win their matches, they will spend a pretty penny on Enchanting boosts. Just My Two Copper expects direct enchanting fees as well as the costs of Enchanting materials to rise during the start of the patch.
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First up we have patch 7.3.5, which was implemented several months ago as a major shakeup to how leveling was approached. Instead of going from low to high level zones like the way the game had always operated, Blizzard opened up the map with more of a Guild Wars 2 type system -- you now have more of a choice of where to go with a scaling mechanic. But when combined with 8.0's massive stat overhaul, things got murky.
Allowing WoW Tokens to be used for balance creates new demand for tokens. There are some players in WoW with lots of gold who have considerable excess even after paying for their subscriptions with tokens. There is a limit on the amount of subscription any player can use, and that amount of tokens doesn’t make a dent in the gold hoards held by some players. Now, assuming those players want to buy stuff in other Blizzard games, they have incentive to buy a lot more tokens.
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As you can see, every profession is represented with these quest givers. What I was alluding too with the scrap bot is if you scrap your gear, you will have the mats required for someone who has this profession to be able to make the required item for you. That or you could trade other players for the items required for these turn ins. You will need the help of other players or a lot of gold in order to complete all 11 of these turn ins. Having a guild here will help a lot with this process.
C'Thun - Alliance C'Thun - Horde Chants éternels - Alliance Chants éternels - Horde Cho'gall - Alliance Cho'gall - Horde Chromaggus - Alliance Chromaggus - Horde Confrérie du Thorium - A... Confrérie du Thorium - H... Conseil des Ombres - All... Conseil des Ombres - Horde Crushridge - Alliance Crushridge - Horde Culte de la Rive noire -... Culte de la Rive noire -... Chamber of Aspects - All... Chamber of Aspects - Horde Colinas Pardas - Alliance Colinas Pardas - Horde

At Level 100, we recommend that you take the talent Unholy Frenzy. If you choose to take this talent over the other 2 options, then we recommend switching your Level 57 talent to Bursting Sores due to the great AoE synergy between these 2 talents. If you choose to use the talent Army of the Damned, which is an easier talent to play with, then we recommend staying with the Level 57 talent Ebon Fever.

Something to keep in mind as well is that this will make enchanting materials more valuable, since it is likely most players will now simply scrap their boe greens instead of getting them disenchanted. Also redundant dungeon/raid gear can be scrapped rather than traded to the (guild) enchanter in the run. Less stuff gets disenchanted, meaning there will be less ecnhanting materials, meaning their value will rise. All the more reason to DE rather than scrap as an ecnhanter.