Being as you will be time limited, the 1st thing that I would do, is grab all the data plate info and serial/part number info for the airframe, engine, accessories and so on. With that info, you can spend off time back at school pulling all the AD's that apply and getting together all the info for those to be checked on another trip. Second, go here;
https://support.cessna.com/custsupt/contacts/pubs/ourpdf.pdf?as_id=37399 and download that document and print it out. Go thru it and familiarize yourself with all the inspections that need to be done. As the a/c is over 20 years old, most all are going to be needed...There is lots to do. Lastly, I'd just give the entire airplane a general checking over, haul it out and wash it and wipe it down and a decent cleaning. Don't bother doing anything other than maybe pulling and greasing the wheel bearings before moving it around too much. I would not even think about pulling the prop or turning over the engine right now. Make a list of what you can see that it needs directly, such as oil, filters, brake lines, hoses ect. You can chase that stuff online back at school, and order it so it's there for the next trip. With all that info gathered up, you can sit down and build a plan of action, to get every thing accomplished and the a/c back into tip top shape so that it lasts you until you quit flying and doesn't nickle and dime you to death.
With digital camera so cheap, photo everything as you do it so that you can refer to them as necessary when back at school. Anything that you take loose, or off, gets bagged, tagged and dated so that it can go back on easily. Keep a log book in something like a spiral book in the a/c and log everything you do and why, since you will be working off and on, with long breaks between work times. Also, document all the time you work on the a/c and what you are doing, so that you can use it for part of the experience time for getting your A&P...You also want to note what tools you readily need for your next trip and start accumulating them, unless you already have a decent collection.
Above all, have fun and don't get discouraged about how long it takes to get her back in the air.