A good place to start is with the Secret, it is in book form and movie. For someone who wants to start to learn how to visualize and manifest in the simplest way the Secret is the way to go. It was the first place I started and since then I have advanced to more complicated methods but without understanding the basics, that are offered in the Secret, the more advanced stuff would be too difficult to understand. After the Secret I started to study the mediums Abraham Hicks and Bashar (both free on youtube). This helped me get to the next level and eventually I worked my way into Kabbalah, or Jewish practices on manifestation (this is free on Youtube also).