What you need:
1. A Tracker
2. A free cleint that works the easiest
For a free tracker I recommend http://owntracker.com/ :) pick a name and it works. And here is the best client that any one should use without a problem, it is called DropTorrent, it will simply make the torrent for you in matter of seconds.
Then seed with one of these clients AZUREUS, ABC, G3 Torrent, Bitcomet, Bittorent
Here is a big huge list of bittorent sites if you want to make you torrent available to everyone...