May not be a great bargain for the northern plains in January but you certainly did not get screwed. IMHO buyer and seller both got treated fairly. You also made an excellent choice for a first bike. While I doubt you'll need to do many of the repairs covered in this thread it does offer suggestions on things you'll want to look at and should help you to become familiar with the bike. I would recommend replacing the brake shoes unless you know that's already been done.
Basic Checklist for that New to You old Bike
PM sent regarding manuals.