Can anybody point me to some tutorials on how to get a custom model into the game? I've been a video game dev for about 30 years and I've been using Unity for about 7 years. I've got no problem building the assets I need. I just need some pointers on how to pack it up so the game will see it?

Also... The whole reason I want to do this is that it is a complete PIA trying to create a pine tree farm. The trees are either too damn big or it's the skinny with no needles that in no way grows like a conifer. So, I want to create some smaller trees where the branches don't extend out past a single tile.

Thanks!