Oh, and using normal turning with a cleric that doesn't have a decent level or charisma score is a pain the ass. the Undead won't be destroyed, they'll flee...and you have to hunt them down.
I would rather have them fleeing then having them all continue attacking me at once, especially at these low levels. At higher levels, I will also be happy to see particularly dangerous undead fleeing from me rather then killing me.
Greater Turning = death to every undead on screen
If I actually cared about doinig the best I possibly could, I would of taken Sun Domain, yes.
Blunt weapons or heavy weapons = dead skeletons
Ahead of you in that regard - the party already has a set of bludgeoning weapons. But my experience is proper weapon type > heavy weapon, something that has been hammered into me from years of playing NWN.
Attacking the giant at lvl 1 = suicide. Wait for LVL3 and have hold person/monster and Ray of Enfeeblement ready
Lester can't take Ray of Enfeeblement, as it is one of his prohibited spell schools. For Luna, I am considering Ray of Clumsiness instead, just for something different.
Besides, a TPK sounds like fun to me! Was planning on asking the party if they wanted to fight the ogre, but since you went ahead and spoiled it, I guess I will just attack it with my level 1 party without asking

Oh, once you find the rainbow rock (roughly in the center of hte map), expect an undead cleric to pop up with his guards. Consecrate is also a nice spell to have there.
What's this, you say? Another opportunity for a TPK from an event that was not a part of the vanilla game and would of caught me by surprise? Fun times! I'm all for TPK's.