When someone is trying to sell their cars, it would make sense that they would want to advertise the car through the media that show the car off to as many people as possible. Once upon a time, magazine ads were a popular means for that.
Currently, the typical thing to do would be to sell cars online through websites like www.carsoup.com/. Why sell a car online? Well, apart from the obvious fact that selling your car online may make the largest share of the pool of potential buyers, it also has the benefit of being a rather simple process to set up.
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Ideally, the first step should be to go and take pictures of cars that can be posted along with internet advertising. The aim is to fill the strange and subconscious need of the average consumer to know what they are buying.
The second step in "sell a car online" process, of course, is to actually create an ad. Typical details included are the make and model of car, price the buyer requests, the overall condition of the vehicle, the seller's contact information, and time convenient for the seller to be contacted.
A piece of advice would be to put the ad for your car on many websites as possible. Doing so will maximize the advertising opportunities discovered by an interested buyer, which is a selling point of used car online.