Im completely new to Halo 2 Modding.. and I would like to get some of my questions out of the way.

First of all..
I have a Xbox 360 and was wondering.. do Halo 2 mods still work on Xbox 360?
Secondly,
How do you get the Halo 2 Mods onto the Xbox 360.. Sine the 360 Now has 2 USB ports, might it be possible to mod without and changes to hardware or so?
Lastly,
If i Mod, will i get banned from Xbox live? If so, even if I make a new account?
Thanks alot.. I appreciate any replies