There are many ways to level. A lot depends on what is currently working with the bot. Questing is very nice when it is working, although it hasn't worked right since the 5.0.4 patch. Sor accounts give you a free 80, but most times ends up being banned. Grinding profiles are more stable but don't gain as much XP /hr as a functioning quest profile. From level 60 and above, you can level via mining/herbing or ArchaeologyBuddy. You could level using BGBuddy or DB but I highly advise against using either of those. You can RAF your toons and power level them in instances, which is probably the fastest legit way to do it. You can park your alts some place and power level them using a 90 to repeatedly kill rapid respawning mobs. (This I also concider to be very risky, more so for the 90 than the alts)