How to input Course Contents.

your extension has wonderful features. but my major problems is on how to add course contents. i can create a course from the front end.. but were will the contents like Texts, videos, audios etc of the contents be inputed so that when user make purchase he can start accessing it, it is very difficult to do this, i have used several LMS systems which are very easy to do this i am saying now, please i will hope to get a positive response from you on how to input course contents. thank you