Sorry, wish I could help, but I have forgotten most of the game design I learned. Try researching the import settings though, because .fbx is Unity's default import format.
Yes, the .fbx file format is compatible with Unity. And no need to credit me, I made these years ago and have since moved on from 3D modeling game assets 👍
These assets are licenced under Attribution CC BY. If you could credit me by putting my accout name and links to all assets used in you creation, that would be great! Thanks for asking!
Yes of course! I appreciate you reaching out to me. When your game is complete, please send me a link. It will be fun to see how you use the assets. Have a great day.