AV can be audio visual or anti-virus or something else.
The biggest money drain for audio visual is over investing in camera gear. Many get by with what they have or rent.
Young entrepreneur on the verge of starting a AV company. Any veterans out there who wish to share some knowledge of what they should have done a certain way, or possibly what they should not have done at all? ( For this posts sake, we will keep this strictly regarding the Start-UP of a AV company. )

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic