TheJadedMieu: AARGH SPOILERS AARGH EDIT IT EDIT IT NOW
Neomega: I think it's a bit late for that now.
@james, thanks for the advice. I assume the first level/s are gained from fetch sidequests and the like as opposed to direct combat?
Hmmm, more like a combination of fetches and combat. You don't actually get that many XP for fetches either. You're not going to be levelling up quite as quickly as you'd be used to in recent games. You'll need to find some easy combats to supplement your XP rewards: go looking for some wild dogs, gibberlings and hobgoblins. Remember also that your combat effectiveness is determined by the quality of your equipment as well as the level of your characters.
There are a few good guides around that will help get your play style ready for BG combat. The first couple of things you should do are to equip all your characters with slings or bows, and to go into the game options and make it auto-pause when an enemy is sighted.