Log on to eBay (See Resources). Click the "Sell an Item" button at the top right of the screen. This takes you to a page with a drop-down menu.
Click the drop-down menu and type in the words that best describes your book. For the most part, you can just type in "Ebook," but adding a short segment of the title might also help. This takes you to another screen where you can further subcategorize your book. From here, you can type in the name of the book or just click the different boxes signifying the genre of the book.
Type in the essential details of the book on the next page. Include title, author and perhaps an excerpt from the book. Set a price and press the "List item" button.
When someone purchases the book, you can receive an email address where you can send the ebook to them. Have them send you a conformation email that they received the book.