To mods or admins i linked to mpc (good reasoning tho), if it inappropriate please delete the mpc links. I am just trying to help out someone that no one else was and am not trying to break any of the rules in doing so!!!
Best help right now would be probably the tutorial section here
Allied Assault - UC-Tutorials - Multiplayer Game Hacking and Cheat Tutorials
then there is mini tutorials such as Virusss opengl tutorial
UC-Downloads - Multiplayer Game Hacking and Cheat Downloads - OpenGL Tutorial
or skinning tutorial
UC-Downloads - Multiplayer Game Hacking and Cheat Downloads - Skinning Tutorial
For source codes here is a couple links
UC-Downloads - Multiplayer Game Hacking and Cheat Downloads - Retribution source code
and I dont like linking to mpc but I will anyways because there the only ones that have corruption 4.0 open source file. This is the only hack with a working aimbot for mohaa (right click here then go down to properties and copy and paste url into ur browser without spaces)
Here
And finally mohaa framework (also mpc, right click here then go down to properties and copy and paste url into ur browser without spaces)
Here
Even though this is a dead game it is great place to start learning to code/hack because it was a fairly simple engine to work on. If u need more just ask and ill try to come and go on here to help or update ur arsenal
Sorry I cant be of more help but even I have slowly left mohaa and only play it like once a month =/