Hope I'm not too late posting! But just in case, a few tips: make sure you're very, very specific in your listing, and also make sure you specify payment details like when they must have payment to you. Another thing - if you're going to allow international buyers, which I always do because it gets you more bidders, is mention that paypal must be used to pay, and that the shipping costs stated are for US buyers only & all others please email for quote.
I'm sure I'm leaving something out, if I think of it I'll edit this post. Good luck!