how to

I am currently using drupal and I am in the planning stages of creating a "online school" per se. With all the modules out there, I am not sure which ones to use and if they would work as intended. My outline/workflow would be as follows:

1. Create a teacher role
2. Allow teacher to create a "class"
3. Allow users to enroll in class with and without payment (Ubercart, Userpoints, something)
4. Grant access rights to class once payment recieved