GS500 Prevenative maintenance
 

I just purchased a 2007 Suzuki GS500 with about 9000 miles. The previous owner new nothing about bikes so the basics have not been done when I got it things like the chain had been rusted so he had no idea what he was doing with the bike. What are some basic Prevenative maintenance I should do seeing as the bike hasn't been worked on in a while?