This is pretty much beta testing they don't need to tell you what class goes to what job too they release the update. I level up Pug which i was hoping for monk so Pug should become Job=Monk If your GLD it should become PLD if your level up conj it should become blm or whm if you level up MRD it should become DRK or Warrior you but that just my guess.

Best bet is level for now and wait when it's release.