Might want to buy something small first on there, get at least one positive feedback before diving into high dollar sales. Folks are naturally suspicious of newbies online (for good reason).
Alternatively, you can do what I did and reference your ebay account seller feedback page and invite folks to contact you on ebay if they had any concerns. I had a number of bidders double check my ID through ebay. Of course that only works if you have some good seller feedback on ebay