Certain locations in World of Warcraft – primarily inns, capital cities, and private instanced zones like your garrison or class order hall – are rest areas. You know you’ve entered one because your character portrait will gain a “Zzz” icon where your level is normally shown, and because you can immediately log out of the game instead of waiting 20 seconds.
These quests for the amount of time to complete them are not worth a spot that a green quest and above takes up save for questing achievements - this can be finished up later at higher levels (such as for the Loremaster achievement) - or for later rep grinding. Do green quests as soon as possible to avoid the drop in experience when they turn gray.
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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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.
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.