Affiliate programs are the foundation of that new industry.
Stay Focused on the content of your site. You will see many affiliate programs offering large commissions and you may be temped to go for them, don't. If your site is about Books, then stay with affiliate programs that deal with books and magazines Books Magazines Affiliate Programs or your area of interest maybe Marketing Marketing Affiliate Programs , which ever it is, stay focused on that content and the affiliate programs that go with it. My Favorite Affiliate programs directory is Commission Junction for the vast array of tools they supply that makes this whole business as automated as humanly possible. Most Revenue Sharing Programs are Free to join and come with a web site full of marketing material and tools for the promotion of that affiliate program.