I hit up a bunch of forums where tesla owners hang out , ask for help like best spots to sell thier teslas without being tracked and i listed for them for free and asked for $50 when / if they found a buyer. This was back in 2016. It was all the honor system. I actually didn't plan anything. I just kept experimenting over and over and over jacking up the price / testing all day and night. I think there was a LOT of luck too.