I'm on my second start. The first start I played until the bridge, where the farmlands start, but I felt I had missed too much on the way.
I like to make a couple of restarts anyway, to get to grips with how things work. On my first start I mainly used the bow, and now I'm trying to get to grips with using magic.
I read somewhere that even for a mage it can be good to invest first in strength and agility, as you can't rely on magic alone. I see those nice axes lying around everywhere, so now I'm mainly investing in strength. Whether that's clever I don't know.
The RPG I played before this is Eschalon, and in Eschalon it certainly isn't clever to spread your skill points out much. Also restrictions like 'must first reach level x before investing in this further' don't exist there, so you can focus on just a couple of skills, reach a high level in those, and that way you get a much stronger character than when creating a jack of all trades.
I can recommend the game by the way, incase you haven't heard of it:
http://www.basiliskgames.comDivine Divinity has a more restrictive character setup. What works best here I don't know yet, but I plan to make lots of mistakes and to learn from them!