Should I just be putting points into dex, or what?

It's really just based on personal preference. When I was a figher I used to put all my points into str and try to get as much dex as possible with my armor and get even more str with my charm. Giving my weapon really high damage but with less critical hits.

You just need to expirement around with different things and see what you like the most.

all depends.

i like between 120 and 140 into dex, then rest into str

I have done this and listened to killerbee it really seems to work =).