Option 1: for Users, have a True/False property “Is Admin”. If “Is Admin” = True, then user can create classes. Make an action which creates the class to be conditional (happens sometimes), if Logged-in User → Is Admin = True, then run this action. You can also add a 2nd action for Logged-in User → Is Admin = False, linking to a modal window with the text “You need to be an admin to create the class”.
Option 2: Allow creation of classes by everyone, but have a True/False property in the class, call it “Is Approved”. When user is creating the class, set “Is Approved” to false. Build a page for an admin user to approve classes.
Most probably you’ll use both options combined.
Best regards, Victor.