Hiya, Jake, and welcome to you and your new-ish B
eemer. If it's car, it's a bimmer... or if it's like my mom's 3-series, it's a
bummer.

Get that puppy reloaded with fresh lubricants -engine, trans, driveshaft & final drive. If the tires are several years old, spend the money for fresh rubber rather than on possible medical bills. Confirm age and condition of the battery. Then, you can move on to a fuel tank flush, float bowl inspection, wheel bearings and brake service.
Git 'er serviced and safe during those chilly Wisconsin days. Post up questions. Gotta shop manual? There's an R65 owners handbook in the FAQs section available for download.
Have fun

Monte