CFM: which class do you recommend I play on my first playthrough?
Raze_Larian: The warrior class is probably the easiest to get started with (and in terms of unique weapons, the game is fairly biased towards swords). The survivor class tends to be the most challenging to play; they have skills for daggers, but the damage output isn't going to match that of a sword. Poison Weapon can help with melee weapons or bows, and is a good fit if roleplaying an assassin type survivor.
Mages can use a variety of spells, and at least at the start of the game a bow can be helpful to conserve mana. The Meteorstrike spell (that the male mage starts off with) is a good damage spell that can be cast quickly and has a bit of a stunning effect. Hell Spikes is quite good once it gets to level 4 or 5. Blind is useful as a first step to taking out single targets. The survivor's Curse spell is another good spell to use in combination with anything that can be resisted (Polymorph, anything doing poison or elemental damage, etc); it can be cast quickly and repeatedly on a target to greatly reduce its resistances, so even just level 1 can be very useful. Burning Wall can be very effective for crowd control or single targets, but for best effect it requires good timing and coordination to get as close to opponents as possible (usually you can also lead opponents into the wall if you cast it at a safer distance).
differences between classes (minor spoilers)
Early Starter Tips (NON-Spoiler Version) (contains much of the information in the above topic)
Other than the class-specific differences, you can mix and match skills and weapons, adjusting your playstyle as you progress.
ARIC'S WARRIOR GUIDE Archery as a warrior - my thoughts Kaan's Mage Guide Playing a mage character... The topic
sorta new, got a quick question contains some information on playing survivors.
Divine Divinity Character Development FAQ Sorry for the late reply, but thank you so much for your great reply. It'll prove most useful!