advice on how to set up a subsription based website

I need advice on creating the subscription platform for my website. The product is training videos. clients will be able to view free sample content, and may sign up for a monthly subscription to view additional content. There will be different levels such as $10/month to see this series, $10/month to see another series. A premium plan to see all. The will also be a tie in to purchase a DVD, which comes with a trial 3 month membership. ## Deliverables The deliverable is advice. I have the content built. I need to know how to move forward with building the subscription part of the site and setting up for credit card transactions. I am not a programmer, this is not technical advice, but more of a summary so that I can decide how to move forward