The wonderful use of torrent, which is p2p (person to person) file transferring, it is a good way of transfer files if there are lots of people who have the file, which are called seeds. You also need to look at the leachers, which are the people who are downloading the file. So once you know this now you can go to step two. Finding a good torrent site ad some software that allows you to download the torrents. Well you can use a search engine to find some torrent sites or these torrent sites work well: http://torrentz.com/ ; Kickasstorrents.com ; piratebay.org
After you have done that and found a movie you, still need to find a program to download these files for the torrent sites, You can use : Bittorrent, Vuze, Ares, and there are multiple others.
What you do with the torrent is your responsibility and the website are not held responsible if you make multiple copies of the file and sell them...
