Ask What should I know when creating a membership site?

[SuperAffiliateX]

I'm interested in creating a membership site but not sure where to start. I want to make sure I set it up the right way from the beginning. I know there are so many things to consider, and I don't want to overlook anything important. I've heard about payment processing, content protection, and user management, but I'm not sure what else is crucial for success.

What are the most important things I should know before getting started?