You can create your listing the same way you would if you were listing any other part/item. Include photos, a description, an asking price, and some marketplace tags to describe your vehicle. Once you post your listing, you'll have access to a number of sharing tools to help you promote your listing to Facebook, Twitter, forums, and more. After that, you're all set!
I'd also suggest reading this community article on listing vehicles in the marketplace: Listing a Vehicle on Panjo
Hope this helps!