For a starters... use 6 players lol. This game is way too hard to go with 4 on a first run through. Check the difficulty... make sure its not "Heart of Fury" mode... as that will decimate you (I got hit with a 80 hit from a normal troll... with my BEST party).
For your fighter guy... this mignt sound wierd but have full stats on STR DEX and CON... the dexterity will help im hit a LOT more and result in higher damage also.
I also see you dont have a Cleric/Druid... these are a must have as you will need healing + support spells a LOT in Icewind2...
Personally if i were you id start over from the beginning.
Use 2 fighters. Ranger or Barbarian. Cleric. Thief/Bard. Wizard/Sorceror
Put the difficulty on easy to start with until you get your bearings... and you should be away 
