Automated Document Assembly

Hi there, I have a website ([login to view URL]) that sells legal forms (in .doc, .rtf, and .wpd formats). Users have to: (1) select their legal form, (2) register, (3) go through PayPal, (4) arrive at a thank you page, (5) sign in to download their legal form, and (6) arrive at [login to view URL] to download their legal form. Now, in ADDITION to my existing system, I want to create a new system to sell my legal forms. I want to create an automated document assembly system. With this new system, users will: (1) select their legal form package, (2) customize their legal form by filling out or selecting information (e.g. text fields, radio buttons, drop downs, etc.) in a number of stages, (3) read important information about the area of the legal form they are filling out, (4) see their overall and specific progress, (5) see a preview of their legal form, (6) register, (7) proceed to PayPal, (8) arrive at a thank you page, (9) sign in to download their legal form, and (10) arrive at [login to view URL] to download their legal form.