Tips for privately selling a used car

Dear Tom and Ray: I am planning to buy a 2006 Subaru Forester this year and don't want to deal with the trade-in hassle and rip-off, so I'm thinking about selling my five-speed Subaru 1997 Impreza Outback Sport privately. But I've never done it before. I've had all of the required maintenance done on a regular basis, including timing belts, brakes, new clutch, tires, tire rotations and oil changes. It has 170,000 miles on it. I've been the sole owner. Also, the yellow "engine" light has been on for a few months, but there's no problem with how it drives. Externally, there is a dent in the front passenger nose above the wheel and no hubcaps. I guess my question is: When I sell it, am I supposed to have it evaluated first and give a list of its known problems? I just don't want to spend any more money on it. How much do I need to do before I sell it?