Implementing a web system

I am trying to create a teaching/learning web system which is real-time and can be accessed on laptop, tablet, mobile and so on. It should have mainly 3 modules, which are uploading of lecture notes and videos for students to watch, instructors can write on lecture notes during lecture and students can see in real-time , 1 module for instructor to release in-class self-test or after-class self-test which can be multiple choice or short questions and instructor can get the answers(text and drawing or choices) and have a look, 1 module for a live in-class Q&A box for interaction using audio, text and drawing. How to get started on making the system , what languages to use, where to do research and how to implement the system. Please give me some idea.