There are a few ways to approach this, but also depends on what your scope is. And that scope implies to which extent you'd need to learn a bit of scripting either in Story, or potentially a bit of lua with Norbyte's extender. Most of the active modding community hangs out in the Larian Discord where there's also a modding resource channel filled with stuff to get you started in most things.
Larian Discord Invite:
https://discord.com/invite/LarianStudios
