Levelling in World of Warcraft is much easier than it was in vanilla WoW days. We have heirloom items that level with us, the dungeon finder, PvP with experience points. But there's still a lot we can do to make levelling even more quicker (and fun) and GOM TV's here to share all of it in his video.
These tips are for people who already have at least one max level character and want to roll a second one for WoD, but actually everything except the parts on the heirloom items would pretty much work on a completely new account.
WoW Alt Levelling Guide patch 6.0+ by Matt Rathbun [GOM TV, YouTube]