If you have something to sell than affiliate programs is probably you best way to go. Affiliate Programs are an advertisers' way of generating revenue through the use of other companies/people. We will use ClickBank for example, when a product is submitted to ClickBank it is submitted with a sales page and an affiliate program. The affiliate program will offer the opportunity for others to sell the product and in return a percentage of the sale price is given to the affiliate. If you take a product for and submit it to ClickBank and offer a 49% commission to all affiliates who sold it, affiliates would sign up to the clickbank affiliate program and find your product in the lists of products like yours and a hyperlink would be issued with a personalized ClickBank ID integrated inside the link. Place the personalized link on a website anywhere where you think it will generate traffic. The personalized link will direct the customer to the sales page of this certain product. If they end up buying your product you will receive 51% commission. So if 1000 people sell your e-book for you that's $25.50 X 1000 = $25,500 which is quite a nice little earner for you because of your product.
Joining affiliate programs on Clickbank and promoting other peoples products' is even easier than offering your own product. Being an affiliate is easy money for very little work, it is very simple. All you do is have an area on your site to sell other peoples' stuff.. No need to deal with the sales, tax, etc. Its all the product owners responsibility. All you really need to do is try to bring traffic to your site.
http://www.cj.com – Commission Junction has some of the best affiliate programs available.
http://www.clickbank.com – As mentioned above, ClickBank offers commission on all types of ebooks from independent Authors
http://www.linkshare.com Some excellent companies to choose from here.