Creating a mod

[loktar]

I'm currently using MPQDraft to load the game with a custom MPQ.
But I'd like to go one step further. Specifically:
-Change the Campaign screen behaviour to have multiple levels (i.e. redirect to another/hidden campaign when clicking a mission). Currently doing this by loading a map that sets the campaign screen.
-Load a different map than default when clicking the Credits button in main menu (without replacing/overwriting the original credits map)
-In the future: edit the game setup to accommodate additional races, like in the Nirvana mod
-Also in the future: add a setting in the game setup menu

I've looked at EasyHook and Sharpcraft, but I can't really figure out how to get started with those.

Any help is appreciated