hi
basicaly what you can do is go on the game creators store and search for floors or you can make them with the easy to use segment builder called firma v2.
what you need to do is go on a texture website and pick grunge textures that look like broken floor boards, the only thing you will notice is if you have fpsc on hi res it will look good, low res will make your game look crap.
Only get texture with hi quality tho, coz low ones, even on hi look like pictures and not the real thing, so signing up to a texture website will have to do, and you can download a certain number of textures.
once you got your textures, open up firma v2 after downloading for free, and make your wall textures, and floor textures for that room, save it, and it will automatically show up in your model pack section under firma. you may need to link your firma software with the model pack folders.
hope that helps.
Tomb Time: Out Soon