That depends on the niche somewhat but ClickBank is a good start

Well what I will do is social network, Facebook especially. With simple iFrame app you can go viral in less than 24 hours and if you chose catchy title and nice short description success is guaranteed.
This works perfect if you have already web page because using iFrame facebook app visitors will not moved from Facebook but remain inside it and thats good point of iFraming.

In order to get your ebook to go viral, you need to get lots of people talking about your book.

The best way to jump-start that process is to give copies of the book to people with already large audiences, and then hope they like your book enough to tell their readers about it.