If you're trying to do a realm first, then questing from 1 - 58 might be a giant waste of time if you have a booster available to you. Boosting to level 80 takes 20 - 25 hours if you're a pro. There will be downtime in between the instances because you will hit the lockout. I'm going to bet that even if you only did instances via boosting and you just ate the lockout time, you would still reach level 58 (and beyond) faster than questing.

Quote Originally Posted by JohnGabriel View Post
You probably cant transfer an existing toon to a Panda until after realm first 90 achievement is given out. Didnt they do that for Worgen?
There is no Realm First! achievement for Worgen or Goblins. Blizzard allowed people to faction change to them from day one of the expansion.

However, the OP is going for Realm First Monk (class, not race).