How to best pivot from one-off sales to subscription?

Hey PH community, I'm looking for advice on a small pivot. For a while I've been creating training content for one-off sales, and I'm thinking of pivoting into a monthly subscription model. In this model, subscribers receive a token for one unit of content per month. How should I best move towards this pivot? For example, should I overhaul my site, or create a new section on my site?