Build a website to sell training videos

We want to make a training selling websites with following features a) Admin should be able to create new teachers and courses b) Admin ( or respective course teacher ) should be able to upload pdf, images , MS office docs and video clips ( of up to 2 hours duration ) c) Students should be able to browse / search / see the available courses on the websites along with their prices d) Students should be able to register the courses by paying through their credit cards or paypal accounts e) Admin will share the URL's of each courses videos for the students and share with the students , these URLS ( Will be temporary URLs for each course videos and should be usable once only ) e.g. Mr. David is a teacher and uplaods a course of 10 videos Alex and Jerry are two students they pay the fee and register for that course. Now admin will approve their request of course registration as soon as the admin presses approve button ( separately for Alex and Jerry one by one ) Two sets of URLs of 10 videos will be generated ( for the course of Mr. David) these two sets will be shared with Alex and Jerry ( via email auto sent when admin approves the course ) these URL's will be useable only once and tracking should be available on the admin side that are they used or not ( means how many URLs students have consumed ultimately getting an idea about course completion by the students Alex and Jerry Student can see the URLs ( or videos in the same sequence as defined by Mr. David) students cannot skip or jump or watch a video out of sequence) Students should not be able to download the videos on their side