Congratulations! You've reached level 20. Alliance characters have a lot of different paths they can take at this point. Here are some links to give you options going forward.
Alliance Leveling Guide (21-30)
Jame's Alliance Leveling Guide (31-40)
41-50 and 50-60
I mentioned Zygor's guide earlier. Considering the Official Guide is $24.99 and weighs 10 pounds (ok, not really, but it's not something you could sneak in to work or class and read at your desk), Zygor's guide is worth the extra money. Keep a copy at work and one at home. Nothing like printing off a few pages for some bathroom reading or a little studying during lunch. Just don't tell my boss that's what I do, ok? In addition, the new in-game guides take care of the problem of alt+tabbing to go back and forth between WoW and the guide.
