How do I go about getting access to a private tracker?

If this is too much like fedposting, I can delete it. I currently have a *arr+Jellyfin on a remote server that uses public trackers, but I'd like to set up a home server and not get letters from my ISP telling me to stop pirating. I've heard private trackers mostly don't suffer from this issue, so I was wondering how to get on one or who to contact or what I need.