You'll need your vehicle registration or proof of insurance and some proof of your address - a lease will do. Actually, some students say proof of address is unnecessary, but take it if you have it. Keep in mind that parking is limited. UF has 42,000 students and nowhere near that number of commuter parking spaces. If you live close to campus, you can't get, and won't want, a parking decal.
Parking is harder to find earlier in the semester - especially the first three days or so.
One is at the corner of University Avenue and North-South Drive. A new multilevel section has been completed so there are more parking spaces. The traffic here doesn't lighten up until about 2 p.m., and parking is quite competitive between class periods. Pay attention - part of the lot is not designated for commuter decals. A larger commuter lot a little farther from Weimer is south on North-South Drive, next to a parking garage.