Now that you got all the stuff you need, you need the game you want to download and burn. I'm going to give you 2 websites that I suggest and use whenever I download and burn XBOX 360 Games.
*For the second link, you will need to sign up! and for the 1st link, you must open it up in uTorrent.
***THIS VIDEO MIGHT HELP YOU TO DOWNLOAD GAMES FROM XBOX360ISO.COM***