Bring stuff to make your room as homey as possible. I always brought curtains, rugs, a couple plants and plenty of LAMPS. A lot of times dorm rooms only have an overhead light and your room will feel much cozier if you have a desk lamp, a bedside lamp, etc.

As far as roommates go, just be open-minded and try to talk to them as much as possible as soon as possible. You don't need to be best friends, but you don't want to end up living in a hostile environment either. In those first few weeks of school, unless you know people at the college already, you're probably going to spend a bunch of time with your roomie, doing things like finding the dining hall, classroom buildings, etc.

Good luck and have fun!