While this income stream dried up when Legion came out in 2016, Draenor garrisons multiplied the total amount of gold in circulation many times. During the Mists of Pandaria expansion, you were rich if you had a few hundred thousand gold but, after Warlords, rich meant being a multimillionaire. However, the impact of this extra gold was blunted for a while, because WoW Tokens were redeemable only for more game time until February 2017, limiting how much gold rich players were willing to sell.
Ever since Blizzard introduced the WoW Token, World of Warcraft's in-game gold has had a more direct comparison to real-world markets. WoW tokens can be bought with real money ($20) and then sold on the World of Warcraft auction house for gold. Players who buy a WoW token with gold get to redeem it for $15 on their Blizzard account, which is equal to one month of WoW playtime.
My second least-favorite part: leveling ranges. Zones are divided into leveling ranges; some are for levels 10-60, others for levels 58-80, and so on. On the surface, that appears to make sense; while there are odd moments where you're presented with the content from two expansions at once, it does mean that you're more or less going through content in order, at least by expansion if not by level.

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.
Take breaks. Unless you're straight up no-lifing it over a weekend or something, this leveling process is going to take ~40 hours. But any time you do need to step away, log out. That tiny little bit of rested exp is insignificant...but you never know when something might come up and you'll have to leave for a longer period of time than you expected. Better to be logged out and safe(especially with War Mode on) than AFK waiting for a d/c. Plus, you'll need to stretch, eat, shower, and maybe sleep. XD

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.
Avatar – Avatar over Deadly Calm. Deadly Calm seems great until you use it and realize the spells you would like to spam either have cooldowns or don’t even cost rage. It mainly allows you to spam Slam for 6 seconds but I usually have enough rage to spam Slam anyways. On the other hand, Avatar’s 20% increased damage is always reliable and useful at anytime.

Also note that power leveling is sometimes used to refer to paying someone else to level your character to cap as fast as possible (i.e. they power level for you); a distinction used by Blizzard is to refer to the paid leveling as "power leveling service." This behavior is against Blizzard's Terms of Service. Power leveling yourself, which this article covers, is perfectly acceptable.

Second: I have found that the most effective way to level (which comes as no surprise to many) has been using the leggos KJBW and Sephuz’s. KJBW allows you to complete nuke down packs of mobs no problem on a 75 second cd and since the damage doesn’t fall off you can clear 10+ mobs in seconds.Edit KJBW has been nerfed to do half the damage that it normally did. It is now a 3.2k Nuke on 75 second cd that doesn't fall off. Though it is sightly more balanced, that does make me sad. I still believe that it is probably the best leggo still to level with but I will do some more research to confirm. Sephuz’s is nice for the MS boost and the proc is no joke. I highly recommend these for every class.
For your tank... I'm assuming you meant which race should you be, not which class, since you seem to want to be a warrior! Well, if you were Horde side I'd recommend Tauren for the health buff. But honestly, I *never* pick a race based on the racial features - only based on the flavor. If you are going Alliance side, I am quite partial to dwarf warriors myself  but pick whatever seems most fun to you!

While the expansion kicks off with heavy references and scenes of this war, leveling through the Horde side of the new content it barely came up again. Except for all the times I had to mine Azerite to make sure my faction was the leader in the Azeroth version of a nuclear arms race. The Alliance side of things had some heavier references to to the war, at least in the portions I played, with one scenario in Stormsong Valley where a fleet of Horde aggressors bombed a town.
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Buffs. Food/Flasks/Scrolls/Potions/Elixirs are a small, but noticeable, buff to your killing speed and survivability. If you have a max level character that can already supply you with cooking or alchemy, you'll be very well off, because the AH is a cesspool for this. I can't really give you specific foods or potions to look for, since each AH is going to have different supplies. Generally speaking, lower level foods are going to only last 15-20 minutes until you can buy the more powerful versions at 60+. Look for anything that adds versatility or your primary stat, and buy stacks for each level range(1-60/70/80/90/100)
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