i have an xbox 360 with games that i play a lot and and i want to use mods when i'm playing alone or with my friends in private games. so where can i find mods and how do i use them??? plz help me... thx.
i have an xbox 360 with games that i play a lot and and i want to use mods when i'm playing alone or with my friends in private games. so where can i find mods and how do i use them??? plz help me... thx.

and pay attention to the plural in games in the question. since i got no live for MW2 cause it's cracked i'm talking about GTA IV, L4D, L4D2, etc.