How to export your 3d building model for Game environment?

Hey guys, blender beginner here. so i finished modeling a building and i was just wondering, How do I make it available to be viewed in like an first person walking simulator where the gamer can view the interior and exterior of the building?

i read some tutorials in the web but most are using like VR headsets so the screen looks like a binocular, what i only want is like an FPS game without using VR.

Can you please recommend a tutorial link if possible? thanks in advance

Search for “blender” and “your engine”, for example “bender godot”, you get the needed links like that: