What do I need to do to make this mod?

[Theme57]

I am trying to make a mod where ammo locations and spawns can be switched around e.g. if I wanted to use the rifle more I could swap pistol ammo spawns, locations and crafting parameters with rifle ammo and give the player the option to do this with other ammo types via FluffyManager.

 

I have REFramework installed and have looked through the dumped SDK, but can't figure out how to edit the actual methods. I am a SWE in Java so I can code, but I'm not familiar with the syntax they used for this game or where to even start. Any help would be appreciated.