So do you not have Wired Ethernet Internet to your dorm room?
I ask because without having a Router setup, you will not be able to connect to any of your devices to get the full functionality of the Apple TV.
IF you can eventually get it connected, Yes, you'll be able to view your iTunes and Possibly Netflix etc.
But you will not be able to swip your phone info up to the TV.
You will not be able to connect to any of your computers/iPhone.
You will not be able to use the ATV as a wireless monitor for your Laptop.
They all have to be part of the same network.
If you had wired internet through ethernet, then you'd be able to connect a router up to that and connect all of your devices with the Router's wireless network and not have to fiddle with the School's.
Why not check this out and see if it's available.