Post an ad with pictures of the inside, outside, engine bay, sills, arches, chassis rails, and underside, write a description 5 paragraphs long, make sure to include what engine it has, when the belt was done, and what diff it has, and ignore anyone who asks anything aside from "when can I come to view it/buy it please?"
Thats pretty much how I had to sell all my MX5s for this reason..
Too many 17 year olds who want it but can't insure it, drifters who want it for 200 quid and assure you thats all its worth, people who expect it to be absolutely immaculate and not have any surface rust anywhere despite it being an MX5, the list goes on... Without even mentioning the ones who can't read and the ones who want to swap you a Fiesta and an Xbox (see; 17 year olds)