Look at the various packs that UMBC offers here -
http://www.ocm.com/Bedding_and_Bath/Dorm_Bedding/Bedding_Value_Paks/
Check out what you need or do not need using the list from the most expensive pack as a guide. I am sure every school will have something similar. You can buy better quality stuff and at less price if you start shopping early and use coupons during sales etc.
The additional things that I bought for my child was slim flocked hangers and command hooks from Costco, a few heavy duty surge protectors, better pillows, measuring tape, door mirrors and double sided tape, a small vacuum and cleaning supplies. She has access to my various online stores accounts and Amazon prime.