Hey that sounds great! What kind of 3D models do you have in mind? Unity's pro-builder can really only do some general simplistic stuff and I have yet to properly learn blender. If something simple and geometric is what you have in mind then I'd love to help!
Really anything. I would like one or two humanoids in the game, but most of the time really anything would work the humanoids would be the main character, and the main protagonist. But other than that most of the game will be just shapes.