rules for ISA server 2000

hello guys… plz I need ur help
i have a cyber cafe and I have a windows 2000 advanced server and I have isa server… so I need many rules to pute it in the ISA policies that let me restrict the acceptance of the camera in the msn and the yahoo messenger, and many rules that block the wmv and the mp3 and the wave from downloading plz… I need help plzzzzzzzzzzz