Go to the student employment website and check for openings, specifically before the school year starts. Once the semester has already started, many jobs will already be occupied. The exception is Campus Rec, which holds a job fair shortly after school starts. If their is a opening, you can either submit an application online, or you would have to pick up a copy at the job site. You will normally have at least one interview, you will at least two or three if you apply for Campus Rec.