Acolyte/Priest
12-30: Heal bomb the undead in Payon Cave until you get heal maxed. Focus on INT for the time being to make things easier.
30-45: Megadalons in Comodo should work pretty well. Kill them until you can get teleport and are able to spam it.
45-60: Do the Amatsu Dungeon quest and kill firelocks for experience until you feel you're strong enough to move on. Or GH Prison, healbombing Zombie Prisoners untill jobchange. Be carefull for the other monsters!