Plenty to join here, best to try to get into one in the off season - then at least you've got a chance to build through free agency and the amatuer draft other wise you're stuck with trading which is difficult to improve if you're stuck with crap to start with.
You could try
http://www.nmleague.com/index1.html, Peoria Gold is vacent despite having a "new owner for Peoria" story on frontpage. The NML is just going through free agency and the Amatuer draft.