You can't get an accurate answer without knowing what kind of paint you want put on it as well as what kind of paint is on it now and how much. What is on it now will dictate what must be done to prepeare it for what you want put on it. Example you can't put base clear directly over laquer.
I'd say if you just want it wet sanded and painted with a single stage urethane and zero body work around $1000 by someone who does it at home on the side. If you are talking taking it to a body shop then who knows.