Clickbank is a good idea. So is PayDotCom. Both of these models work by getting affiliates - or people who know how to market online - to sell your ebook. The thing is, the book has to be of high quality, the book needs to have a really good landing page - and you must make a few sales yourself through your website.
Then you'll have more than a few affiliates getting onto your product and making massive amounts of sales.