Modding Quake III: Arena Thread

I would like to mod Quake 3, but the game is so old that it is hard to find tutorials. I am working in Linux and using gcc as a compiler. How would I go about changing to strength of the machine gun? If I know how to do this one thing, I think I would understand a lot. Is there anyone who can help me? Any help would be appreciated. Thank you.

Edited by: Eagle12687