there are some pretty good guides on how to get started with private trackers out there. the easiest route, imo, is just like it was before wcd was shut down. wcd was basically open, as long as you took your time with the interview process. once in, you follow their simple rules and you easily got access to the invite forum. from there, the private tracker world opened up for you.
same goes today, except what has been replaced with another music tracker that operates pretty much the same way.
myanonamouse is the same way, very easy interview. orpheus.network also interviews, but I haven't done that one yet.