I've privately sold a few cars in my time and found autotrader to be the best based on the search procedure and number of viewers. Unfortunately, time wasters are part and parcel of the selling process so patience is a virtue.
If the rest of the car is in near perfect condition I wouldn't worry too much about the dings or bubbles unless they're really visible. Give the car a good wash before any view and you should be fine.
As for payment, bank transfer is probably the best.
Absolute power corrupts absolutely