One way of doing this is finding a product either via Clickbank or a CPA network like Sharesale or CJ, that has a high commission rate, create a free blogger blog, basically praising the product, and encouraging people to try it out (with ofcourse your affiliate link to the product), then write articles and submit to the best article directories like Ezinearticles and Goarticles, all including a link to your blog in the Author signature area