Monthly Subscription Drip - how to set up correctly

Hi
I am new to Membership (work until today with Wishlist)

I need to set up a membership site - drip each month new content - and still the members have access to the prevues month content.

I setup 12 access levels name M01-M12

I setup Dripped Subscription - Finite - 1 Month - XX$
and put all 12 access levels

My Questions
1. Is this is the best way to setup?
2. Did I understand correctly that i need to use Positive Rolls in the first level and put the relevant content (post and pages) and then in the 2nd level put the same content and the new contend belong to the 2nd month - etc. for each month?

Please Advice
Yakov