Settings will give you the ground reflection (which you've done very nicely).
You will need props or figures (characters) for floor or walls. Settings will not give you these.
In Free Stuff you'll be able to find some floors/walls/rooms to build up a scene.
Make the ground invisible in Properties, build your scene and apply the reflection setting to the floor of your "room". I also suggest you turn off shadows for you lights if you are using infinite lighting, as the walls (& floor)  will block your lights. Better still, turn off shadows for your walls. You could put spotlights inside  your "room" for lighting but you'll need to know how to set them up properly.
Good luck, you're well on the way.