That's fine Jay, note my comment to you in the introduction section :^) But you have certainly found the correct place to look for beginning information.
You haven't mentioned if you will have transportation, so as a Freshman, I have to assume you won't.
Be aware that for many of us this is a "business" and as such, there are tax advantages to it. So when you see discussions, realize that most of us file a Schedule C as a business. As a student, my guess is that the occasional shop will rather be a "hobby", which has no tax advantages. What you earn in fees will just be "additional income".
Both Market Force and Corporate Research offer reasonable instructions for beginner shops. If you have a car on campus you may want to consider Corporate Research as well as they do a number of tobacco compliance jobs at gas stations. As you get older, you will find that there are alcohol compliance jobs also available to the young.
Best wishes with your studies and try to keep shopping to a minimum as these are the years when you will be making friends for life as well as preparing yourself for a hopefully great future!