Dude, a water hose is pretty simple to use....
Clean the underside real well, take a wire brush / wheel on a drill and knock what rust is there. Por 15 the frame and what not, then paint with quality spray paint. Cost you about 25 bucks and you can take her with you. Once a week drive through a car wash and spray the underside.
Unless of course college won't let you have a car as a freshman...or you have another set of wheels.
If it is rust, don't be scared of it, its not gonna jump on you when you drive by. A little preventative maint. will go a loooonnnnggg way.