How do I charge users?

So I’ve started and finished my MVP so everything works properly. One thing I’m struggling with is how to charge users.

The basis of my platform is a social media app with programming tutorials so new developers can connect and learn at the same time. What I’m wanting to do is make the social media free and charge for the tutorials.

My issue is should I charge more for one time to get one tutorial series or charge a little less for monthly subscription with new tutorial series every month kind of like a magazine subscription?