What a lot of people do not realize is that you don't have to have a product to actually sell on Ebay. What you can do is actually create a digital product (for example, an ebook) in the form of a PDF document, and sell that product on Ebay. If you are going to write an ebook to sell it on Ebay, it doesn't have to be very long - 5 to 20 pages should suffice. You can sell it from anywhere between 99 cents and $9.99. To make the ebook more profitable for you, embed the ebook with affiliate links. When deciding an a topic to write your ebook on, try and choose a topic which solves problems - there has to be a need for the product. Also, choose a topic which there is not already a lot of free information available on the internet.