In the beginning , you only have to chose one of three way : Warrior , Mage or Ranger. You still can learn Priest Skill. Anyway , after awhile playing this great game you will realize that playing as pure priest is impossible
Either way, the choice that you make in the beginning doesn't have much of an impact, it just gives you something to begin with. Just choose whatever you believe to suit your tastes best and spend some skill points on some priest abilities as you progress through the game. You can get any class' skills as you level anyways, so it won't be a problem.
Those few stats points doesnt actually help much, even in the beginning from my view. Anyway its all down to personal preference. And its undeniable that there a lot area in game are packed with boxes and barrels. Definitely you can break them 1 by 1 if prefer, but I choose to break all once using whirlwind, which seems more convenient to me.