I don't use gnutella, but that torrent is worthless. You confused a search engine with a tracker.
Here's how to do it:
1. Choose your tracker.
2. Make the torrent, including the tracker announce info.
3. Make sure you have lots of people to help seed.
4. Upload the torrent to the tracker.
5. Immediately get all your seeding friends to join.
6. Once well established, upload the torrent to some search engines.
7. Keep seeding.
You only did the second half of step 6, and you blew all the rest.
I wouldn't 7zip it either, just leave it as an iso. Otherwise anybody that does have the iso will be unable to join your torrent.
The torrent should include a nice readme file with instructions, links, and contents of the iso.
One free tracker is The Pirate Bay. I use Demonoid. PM me if you want.
