free and lifetime paid option with 2 redirect

Here is what I need to do. A buyer comes to my squeeze page and fills in the opt in for a free limited trial he then goes to a free trial registration form page where he gains access to a portion of the members area, after that anytime he tries to click on a link he does not have access to he is sent a to my sales page.
This is a one time fee for lifetime use product. How can I accomplish this.

Thanks