I’m real late to the party, so not sure if you’ll see this or not. I’m a rising sophomore at Gettysburg, and I can address the questions you asked. As far as curtains go, my roommate and I went all first year without them and were fine. I had one or two friends who had them but I think they’re far from essential. Windows all have pull down shades. There are curtain rods if you decide to get curtains, but we just taped a tide pod onto ours to remind ourselves to do our laundry. There’s a big Walmart < a mile off campus where you can get anything you need. My recommendation is to bring the essentials, and fill in the rest afterwards once you’ve seen the room.
As far as laundry goes, there is an app that you can connect any credit or debit card to that you can use to pay for the laundry machines, but they also accept quarters. The app is really useful when it’s working, but it is occasionally down so bring a roll or two of quarters as back up.
A/C: depending on the dorm you’re in (which you haven’t found out about yet), you may or may not have A/C included. Huber and Hanson have central air, so you won’t need a unit (but a fan will still be a must), and the other freshman dorms all have units available upon request with a doctor’s note. Call Academic Advising if you are placed in Patrick, Stine, Paul, Rice, or Musselman as soon as you get your housing assignment because the units are first come first served. You will need a doctor’s note.
Lastly for work documentation. I did not work on campus freshman year, but when I investigated it, it seemed pretty easy. A lot of it is online and through various offices on campus , so I wouldn’t worry about documentation right now as I’m sure they’ll tell you what you need and the process of getting a job is fairly easy on campus.
Hope I answered everything and you see this!