course enrollment key

hello, can anyone kindly suggest me how should i start with course enrollment system. i am trying to develop learning management system, allowing a student to enroll themselves in course with a secret key given by their teachers.

Can i do something like this:

course table: id, course_name, course_code, description, enrollment_key student: id, name, email, password course_student: id, course_id, student_id, isEnrolled(default:0)

Firstly the student logins, he/she opens the course page and since initially his (isEnrolled=0) he is directed to the page of course enrollment. when he enters the random key, his isEnrolled=1 for that particular course after validation of the key.

Thank you and have a great day ahead.