I assume you're on a windows computer so you would preferably torrent either Adobe Premier or Sony Vegas. I have never used Premier so I do not know much about it, but I started out using Vegas and it is probably a nice place to start, the program is fairly simple, but at the same time it works and you can make some pretty good edits in it. Another option is to try Lightworks, I have never tried it. Just heard about it and its free so why not check it out?
http://www.lightworksbeta.com/