Bring only the necessities for a dorm.
Keep a shower basket to organize all your stuff.
Keep a laundry basket in your closet.
Bring at least one change of sheets. Dorm washers usually suck ass and the dryer takes forever. Switching out the sheets and saving a wash for visits to mom are best.
Look in to those cheap little plastic storage units at target or wal mart that fit under your bed and buy desk organizers. You'll be in a tiny space with another guy and organization will be the key to sanity.
Don't forget you are a student and go to class, study etc. Party when you have time, there will always be one.
Join organizations involved in activities you enjoy. It is an easy way to meet people and have fun. For me it was a mt. biking club and a fraternity.
Other than that, just go with the flow. College is fun, new and pretty crazy when you look back on it.