G'day guitarman, and welcome to the Gnutella forums!

You've come to the right place with your questions. One of the Mac users will probably have answers for you soon.

Free torrent sites can be found via search engines. If you're looking for a good torrent client, I would recommend Vuze or uTorrent (not sure if they run on Mac). While Limewire is capable of downloading torrents, it is not recommended (banned from some sites).