[Request] Tutorial on new entities

So far in modding, all I've done is just changing the values already in the game. I saw some other threads, such as, the dinghy car mod and King Arthur's armory (Not that I'll ever match up to their standards ). I saw the textures for the covered dinghy and arrow dinghy and i wanted to implement them into the game as a mod.
I failed (obviously).
The 'Bunny' mod for example only adds one new 'entity'. I tried analyzing it and I got confused mid-way .
So I wanted to ask for a tutorial. Sorry if this is not in the right place.

jwoo2023

 

Moved to modding help.

 

Right, sorry.

 

I don't know shit about modding, but perhaps this can help?
https://forum.kag2d.com/threads/howto-getting-mods-to-run-in-your-server.16474/