If your going to do any sort of xbox Modifications you should first check into
www.xbox-scene.com it has anyort of info you could possibly want for modifying your xbox. the forums are a great place for experienced people to help you out and they have multiple step by step tutorials. This site can teach you anything about soft modding or hardware modding your xbox. Though if you are modding your xbox to cheat well then you should not go there. You would be banned imeadiately upon mentioning anything like that. But If you are modding it just simply to make it better than it is have at it.
again for anyone else that happens to find this thread that needs help modding their xbox go to
www.xbox-scene.com