Godot and 3D: Adding Buildings With Interiors?

Hey, everybody! 👋

After years of hemming and hawwing about switching to the Godot engine, I've finally taken the plunge! I've started working on my first 3D game, and I'm learning a lot!

One thing that's kind of challenging for me right now: I'm a little clueless on the process of creating 3D environments and adding buildings and objects to my game.

So far, I've had decent success with Terrain3D for creating a landscape. However, it currently looks boring, because there's just not a lot of things to populate my play area. Obviously, I need to create some assets and bring them into the game!

I've started looking into the process of importing 3D models for buildings and trees, but it feels like I have a lot of work to do to just set up a single 3D asset. It's kind of intimidating!

I just wanted to ask the community, for those who are working on 3D games: what processes or workflows work well for you, when it comes to adding buildings with interiors? This is where I'm currently feeling stuck and more than a little intimidated.