Congrats on the buy! How much did you pick it up for?
For oil changes you want to go with BMW approved oils.
I would recommend 5w30 from the dealer, I believe it is Castrol that they re-brand as their own. The filter is $20 at the stealership, I'd pick something else up for less, like Mann/Bosch/Mobil 1 (Stay away from Fram)
As for regular maintenance, check the subframe. I can't suggest much else since the car has very low miles. I wouldn't touch anything on the cooling system until problems start to appear.
Even if you are extreme about preventative maintenance, 60k is the earliest when you want to start considering a cooling overhaul.
Good luck! and post pics,