Congrats! AutoTrader has always worked well for me, but the amount of scammers that contact you before you get the true buyer is depressing. I've found good luck in not responding to any initial pings on the car, let the would be buyer contact you at least twice before you respond. You'll also see many of the same emails worded the same way or a bit differently, those are auto ignore. Another dead giveaway are those emails from degenerate scammers where they want to pay your asking price right away with no haggling. This does NOT happen in the real world in my experience.
All who attempt to scam on AT should lose a hand. It's incredible how much scum is out there.