Attributes for new sounds?

Im an audio and music engineer and im going to be adding some new sounds into my mod.
I need to know the audio format to put these wav files in. I will be adding environmental loops mostly, but also sound effects for various particle effects.
I also need to know if its possible to add reverb in whole areas to al sounds tgat go off in that area, such as you might hear in a cave.

Any assistance will be appreciated.