Tips for making atmospheric lightning areas

[HumiliatioN]

Yeah, I'm working on my mod and I still not good making decent lightning on all room areas.. So if anyone can give me some good tips to make decent atmospheric room areas and realistic lightning.

First I tried only making pointlights and couple spotlights here and there.. Now I changed it and have only spotlights in one map like only making shadow lightning coming from the lamps.. is this sounding weird only using spotlights to make light areas? I think I need something add from these areas too.

Secondly how to make really good billboards as well step by step, I watched couple tutorials, but still can't get completely understanding there.

Thanks. - Humi