Lesson #1 of craigslist: Everyone on craigslist is an idiot.
Don't try and sell a car on there, you will get the bottom riff raff of society contacting you with the most insane questions and points of interest. As you have now seen. Sell it in the local paper. Forget autotrader, it does not move vehicles, either compared to the paper (in my experience).
You can put your car next to a busy street and get interest but again you will get idiots asking if they can make payments, have you hold it for two weeks, etc. These people should be put in labor camps.
Something about the paper at least in my experience is that you get people who actually know what a newspaper is and that immediately puts them above the intelligence of the rest of the people. You won't get some doofus who saw your car and gets distracted by wanting it despite honestly having no intention of buying a car.
Also, you still must realize that 4/5 of people who call you are being fvcking idiots and have no intention of buying your car, meeting you when they say they will, etc. so don't go out of your way. Have the car clean and ready to test drive but don't come back from work early or meet them anywhere or anything else. Again, go back to the 4/5 rule and you'll know why; chances are they won't show up anyway and "forget" to call you or, who knows, maybe fall off the earth. 1/5th of the people will be intelligent adults with available money and an actual intent to buy your car, they won't be idiots about it, you'll sign the papers, shake hands, and be done with it. I do think the cheaper the car the more idiots you get because as we all know poor people are more likely to be idiots.