When you get there, you probably want to get the oil changed- they use 0 or 5W30 in colder areas, mostly. You want to make sure you have the snow-clearing stuff before you need it, so when you get there try hunting down an ice scraper or two. I like the ones with the foam handle and a brush on one side. Plastic becomes really brittle at cold temps, and it gets cold in wisconsin.
Get an idea of lowest temps from current students or the weather service. My friend's car didn't want to start below -20*F, and the break and transmission fluids start to thicken up around -5 or-10*F, making it tough sometimes to stop, start, and shift. If places you're looking at have electric plugs in parking lots, you'll probably want to look into getting at least a battery warmer, if not a whole block heater for your car. Don't freak out if it's super cold, though, and your car won't start, if you don't have heaters in it, just wait until the sun's been on the hood for a couple hours, and the temps creep up over -10, then try again.
After the first big snow, get a local, or someone who's been around snow and can drive on it, to go with you out to some relatively deserted area, and get them to teach you how to drive smoothly and safely on the ice. there's information on it on teh intarwebz, but it's easier when someone's there to show you first how it *should* feel, and when you can feel the way the car reacts for yourself. You might not plan on driving on snow now, but there will come a day when you *must haz* ice cream or chips, or note cards at 3am, and the only way to get them is to drive on ice. Better to know in advance, yes?
Hope this doesn't freak you out- it's really not that bad, once you get used to it.
Oh, yeah- and try not to be the one driving, the first time you're in a moving car and it's snowing. It looks really cool, but if you focus on the snow instead of the road, you go flying off it...
-j.