If it’s a brand new membership site, I’d start by getting 10–20 real users before worrying about scale. Offer a free or heavily discounted founding-month access to a very specific audience, then ask for a tiny bit of feedback in exchange: what confused them, what made them subscribe, and what would make them stay. In adult, “test this out” usually works better when there’s a clear payoff — early access, locked content, or a feature they can’t get elsewhere.
For promotion, I’d focus on one channel first: model/creator collabs, Reddit-style communities where allowed, adult SEO, or direct paid traffic if the funnel is already solid. Make sure the site has a low-friction landing page, a strong teaser preview, and a simple signup flow before you send anyone there.
If you’re still at the “how do I structure this” stage, this breakdown of adult platform features and setup is useful:
https://online-webcam.net/blog/adult-video-software