Membership – Starting Point

Ok. I have 3 membership levels – visitors, free and premium. Visitors so people can see our basic info about the show, free for people who want to comment but not pay, and premium for paying members. In subscription plans, I am trying to set it up so that people can have a Monthly Subscription at $6/mo. What I am confused about is which “membership levels” do I pull over to the starting point and in which order?