Hey guyz i need some info if ya please. Ive read the jtag stickies and stuff but i need a bit of a hand.

I got an old xbox 360 and wanna play downloaded games on it, what do i need? where can i get what i need? how do i do it? can i run from discs? all that sorta stuff. Oh and obviously i dont wanna use it for xbox live i have ma slimline for that.I know inferno will probably answer lol so thanks in advance man. Its all a bit complicated i know but any help will be appreicated. Please please if there is some sorta easy guide that would be awesome.