I'm creating a website where there is two types of users, Students and Teachers. I had created one register and login page for authentication. Now by default all the users who sign up will be the students and can access the videos and also accessing teachers area (I did the coding till here).

If someone want to be the teacher there, then they have to submit their documents. After the verification, they can access teachers page. The problem is that I don't know how to give authorization to these user manually from admin panel so that they can access to specific (teachers) page?

I had google it a lot but don't understand how to do this thing. My website is ready but I don't know how to restrict all the users from teachers page and after their documents verification, how to give permission to access the teachers page.