To get the most out of marketing affiliate products you must first pick the right products. Pick products that have a fairly high demand, but very low competition. Once you chosen your products build a website or blog around them using keywords for the products you are selling in the title, the meta tags, in the title tags, the body of your web site or blog and if possible in the web address (URL). After all that is done start promoting. Some good free ways to promote your affiliate products...