Selling ebooks is a long and difficult task for any salesmen/marketer on the web today tho it can bring in a lot of quick income if done right.
If you want to sell ebooks I would suggest looking up two terms in your favorite search engine. The terms are PLR (Private Licensing Rights) and MRR (Mast Resale Rights).
It is important to know that simply finding PLR or MRR products that will sell can be a very long and tiring process. Not to mention that the best ways of selling any ebook would be to take the "Sales Page" it provides and simply using it as a template to create a unique site so your products will be picked up by google and a few other search engines to help generate traffic and in turn sales.
I have went ahead and done a quick search for PLR and have found one site for you to look at. Tho I cannot guarantee the quality or resalability of it's products.
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If you have any questions about PLR or MRR I would be happy to assist you in any way, tho I have been out of that loop for close to two years now.