Probably the best thing about PS:T was that you could approach the game in pretty much any way you chose. If you like, you can play it by solving everything through fighting. If you prefer to avoid combat, I can only recall two fights you HAVE to have in the whole game. Almost everything in the main quest can be resolved through dialogue.
BG1 is definitely very warrior-centric. May all the gods of Toril help you if you decide to try to start the game with a mage. You'll need them to!
