usually whoever chips the xbox for ya puts some software on the hard disk for you, allowing you to transfer games from dvd onto the hard disk. you can also network your pc and xbox together thru a wire, but ive never done either of these

plenty of bittorrent sites about, just need to download yourself a client program such as ABC or AZUREUS before you can use them, have a search for 'torrents' in google and go from there.

hope you got the originals of these games your going to download