Download the Xexmenu 1.1 ISO and burn the ISO with imageburn and put disk in your xbox and it will run Xexmenu for you copy over Xexmenu folder to your HD (look on Youtude some great tuts there), it will show up in NXE dash under game demos them play around with Xexmenu and understand it in's out's, this will get you started. You can also use Xexmenu to install FSD. Also a Youtube Tut:
[ame="http://www.youtube.com/watch?v=IFrwlggo8nA"]Installing Xexmenu v1.1 from CD - YouTube[/ame]