Excess Potion of Accelerated Learning: Acquired in your Garrison (part of the Warlords of Draenor expansion), this gives you a 20-percent bonus to experience from killing monsters and finishing quests. It lasts one hour, but you can buy it multiple times and use it back-to-back. Alliance players buy it from Sergeant Crowler, horde players buy it from Sergeant Grimjaw. Does not work above level 99.
I defintely think at 118 you should go and do all four of these parts. These are required to unlock World Quests and probably take about 60-90 minutes to get through. If you do these whilst levelling (especially all in one go at 118) then when you hit max level you're ready to go on WQs. You can go finish the zones quests at your leisure over the next weeks/months or never even finish them if you don't care about questing.
Third: Don’t skimp out on consumables. I recommend getting 20 flask, 20 Drums, 40 Runes/Food, and about 20 pots. If you are Horde I HIGHLY recommend about 40 Goblin Gliders, it will make your life so much easier. Consumables are pretty cheap right now (on my server at least) and I do recommend you stock up. Ask a friendly mage for some food before you start leveling so you don’t have to waste your buff food.
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