Running the behind-the-scenes membership site in conjunction with WP isn't quite as adorably fun.
Back when I was less techy, I would simply create a Skype group of a closed FB group.
Then I would just put up a buy button on my site. Ideally with a description of what I was offering.
Paypal allows for recurring billing, so that aspect was taken care of for me.
But I wanted to stay selective.... so before people SAW the buy button, they had to fill out an application for my membership site (Moderated).
I'd receive the application, review it, chat with the person, and if there was a fit.... show where the buy button resided online.
Over the years I've done this several times and it works great if you're not working with a bazillion members.
Remember, you can always think outside the box if you want to build up your business. If you don't have time for a fullblown launch or want to teach yourself Wishlist/etc. - the above is a very useful quick fix indeed.