Maximillion1 you may want to add some more information. There is a guide linked to up in the highlighted section at the top of the page.
basically just things like price, size, year, model etc and a photo or two. Direct photo uploads will be a problem until you have a few more posts but using a picture hosting site like Flikr or photobucket is how most of us do it.
Hard to tell what you have from the very limited information given and the more info and description you can give will only make it easier to sell.
Best of luck with it.
Jamie