Get a Clymer's manual. A Kaw service manual can be had here http://www.tocmanufacturing.com/File...nd%20Parts.pdf
. Between these two and asking in here, you get all you need to know.
One of your most important areas is your front brakes. The back does next to nothing. It's not a tough job, but for a bike thats 22 years old, I would replace the front pads, replace the fork seals & fork oil, and put on stainless steel front lines. I can't stress how important those front brakes are to your well being.
Set of pads is under $ 30, complete fork seal parts around $ 30, stainless steel front lines under $ 100. I can't spend your money for you, but these are some of the first things I did when I got my 93.
There are plenty of us here to help you through these tasks. If you are only slightly mechanically inclined, it's a Saturday job. No special tools needed.
After your front brake, comes your tires. I paid $ 1340 for a set of Dunlap D404's delivered. Another $ 45 to get them mounted and balanced when I rolled them inot a Honda dealer. While that front tire is off, your a ways into whats needed for the fork seals and brake pads.
While that back tire is off, you're ready to lube the front and rear splines.
The rear splines aren't necesarily a safety issue (but could be), but a very expensive proposition to replace if they get ruined.
Again, we are all here to help.