Well first off, chinchillas live for about 15 years, and they need a larger cage probably about a 30x24x30 is about right. Your also going to need a wheel, and they are nocturnal. Honestly, I think you need a buddy for them because they seem to love having the company.
As far as living in a dorm, if your dorm room was anything like mine in college your probably not going to have enough room for them and might want to consider waiting for about 2 years till you are living in a larger place. Your going to have to check with your dorm handbook or housing administrative to see if caged animals are allowed.
Still I would bet that you should wait about two years. I think chinchillas are the most interrogate animals out there. They have little hands and are able to pick things up. They are little people, it's just so interesting.
Hopefully this helps