here is some websites ,i suggest you to start with the easiest one you find. https://codecourse.com/ https://letgo.com https://freecodecamp.org

as Bridget Sarah said , i think that's a good idea for your college.

i'm already work on a project like moodle, i work on it in a private company , i will try to get a permission to make it open source, otherwise i will make another one from scratch.

that's depends on what the framework you love and the framework that you see yourself is good and easy for you , otherwise you can make the same thing in both.