-A fridge and a brita water filter if you are going to be in the city.
-TALK with your roommates ASAP. Let them know your expectations, dislikes, etc.
-Be nice to your RA (REsident Advisor). It will not only save your ass but they appreciate it (I now work with them). I went out to dinner with my RA, did the floor games, etc. It was stupid, but they are required to do it. And if you go and put on a happy face, they will be more lenient with you should you ever be loud or throw a party or something stupid.

Per College in General:

-Learn to talk to professors. They don't bite! It can save your ass if you get in a bind. A professor who knows you will be more likely to help you AND remember you when it comes time to grade.