Don't do any bodywork or paint, just clean and polish it up as much as possible yourself without resorting to a spray gun (except maybe for flat black inside the fenders, etc.).
Mechanically, see if you can get it to run. This is the big mechanical dividing line for most buyers. At a minimum it will amost surely need a new battery. Make sure the brakes work, but don't worry about lights or turn signals.
Once the car will start and drive, and is in clean but original (unrestored) condition, you can offer it as an intact, running project. This description should attract the most buyers and $$$ vs. the minimal amount you will invest in preparation.
If it doesn't attract enough money, you may want to restore it yourself on an affordable schedule.