1. Open it up, just the bottom and use compressed air on the dust that's probably been building up for the last 6 years.
2. Fresh install Sierra.
3. Install your software.
4. Enjoy!
Btw I believe the drive is a SuperDrive so it's a DVD player and rewriter as well as CD's. You model will also work with the old white and silver remotes as it still has the infrared sensor, for movies and such if you like.
Your model is also supports to 16GB of ram if you wanted to upgrade but I think that's probably not necessary, depending on you usage.
Great computer, congrats!