[Reiko]

Honestly, the Onion network doesn't have much better than the clearnet in terms of hacking-related crap. Onion IRCs are pretty good, I guess.
Right now, with the Silk Road seizure, there's a bit of fear/uncertainty/doubt regarding the Tor network among its dumber users, so everything's kind of quiet at the moment. Give it a few months and look around again.

If you want to set up a .onion site of your own, then you'll want to look at Tor's configuration documentation and set up a hidden service on some random hacked server.
Just drop some HTML on it with some information about where to send money and who to email for services, and maybe someone will bite.