Basics!
Here I will be showing an overview of how to port a weapon into CoD4 with other per-game tutorials!
Please make sure you've looked through Tools/Programs and Per-Game as there I've gone through for what you'll need, how to set up tools/programs used and per-game specifics.
Exporting models and animations from Maya!
How to Exporting models and animations from Maya
AssetManger (assman)
How to use AssetManger (assman)
Creating a custom weapon def/file
How to a create a custom weapon def/file
MoDBuilder
How to compile your weapon with MoDBuilder
Testing your weapon/mod
How to test your weapon/mod