If you level with friends Prot would probably be the way to go so you could pull and face tank the packs. I leveled 2 pallies both ret on beta and had 0 issues. Selfless healer and wake of ashes work absolute wonders. I leveled a bit as prot and just felt like I did 0 damage. I leveled solo so I don’t know about the xp fall off but I would assume it’s the same as legion.
Fourth: When the enemy faction controls the Warfront, you get access to 11 quests that allows you to trade materials for AP and honorbound rep. This is huge because you get 750 AP per turn in and 500 rep per turn in which gives you a total of 8250 AP and 5500 rep; that is a massive amount. All the material you got from scrapping all your leveling gear will come in handy here and I imagine that you will be able to trade other players for different turn ins. I highly recommend trying your best to do all 11. Also, this will be a great opportunity to make some serious cash for your profession because people will be buying the same items in bulk.
Also get the Heirloom Mount. Being able to have basic riding speed from the beginning will save you a lot of time if you're starting from level 1. Allied races start at 20, so this is a non-issue for them. It's important to note that Pandaren can not use this mount until they finish their starting zone and pick a faction. Being Horde or Alliance is a requirement of the mount.
For scribes who can't and won't go all in with crafting Darkmoon Cards, an attractive alternative is to also dip into the other "odds and ends" inscription items. Particularly popular and profitable are BoE shoulder enchants (both blue and purple rarity), Runescrolls of Fortitude and the pair of companion kites. And if players had to choose only one of these, BoE should enchants are "easily one of the best money makers, in terms of gold per hour" because of their consistent demand and persistently solid wow gold price
According to a recent report, the developers dug into the numbers and saw that this was a legitimate issue, as leveling in that range took about 15 percent longer than levels before or after. While the hotfix notes don't go into too many details, Blizzard explains that the experience required to gain a level has been lowered for the range of levels 40 to 100. That brings the amount of time needed to level between the magic 60 to 80 range down by 14 percent, with a smaller reduction in time between levels 40 and 49. We figure a lot of math had to go into figuring out a proper adjustment here but, assuming Blizzard's estimates are correct, that should appease players who felt like they were stuck within a certain range for too long.
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If you already have a high-level character and want to quickly level up a new one, by far the best tools for the job are the items labeled “heirloom gear.” These pieces of gear have two very special properties — they bind to your account, so any character you own can use them, and they grant bonus experience. Their stats also scale with your character’s level up to a certain point, so you can equip a fresh character with heirloom gear and power through much of the game.
Ravager – Ravager replaces Bladestorm and does about an Execute amount of damage less than Bladestorm. That may seem like a lot. However, one thing people forget is while Ravager is active you get to use other spells at the same time. Where as with Bladestorm all you can do is Bladestorm. So, while Ravager is active you can turn on Sweeping Strikes and use a Colossus Smash, Mortal Strike, and Execute by the time your Bladestorm would have ended. In the end, you will do thousands of damage more.
I made one for my guildies but its for the Horde leveling process. One tip that goes for both factions is that you dont need to do all 3 zones to hit 120. I did like 1 and than three quarters of another. But once your 120 you need friendly with all 3 of your factions new reps to unlock world quests so make sure you hit at least friendly with all 3 while your leveling.