376267 Login/Authentication mechanism

I need a login authentication mechanism. There will be a login form at [login to view URL] The person will enter their name and email address and then they will be sent to their members page. I am not really sure how this system works exactly. On their members page, they will have access to all their weekly training videos. One video will be released to them every week. I need this to work automatically. One new video will become available every week starting from the time of purchase. So if they purchase and start the program on Sunday at noon one new video will be available on sunday at noon every week until the 16 weeks are done. That is pretty much it