Do it EARLY. I waited until end of fall semester to look for a job at a pharmacy and i didnt find one till a week after spring break! Some places even told me that they were not hiring andmore interns from my class (b/c they dont want all of the interns to graduate the same year leaving them with no experienced ppl). So my advice is start the week before school starts and work as many hours so you get a little bit familiar, and then say you want ~10-15 hours until you know how your work load is.