we just used vegetable and table scraps. Also coffee grounds. Very clean, no flies at all!! It smelled like fresh dirt or mulch if you know what that smells like. There is a worm farm in Davis CA you could get more info from them:
http://www.morningmistwormfarms.com/
http://www.envirocare.net/worm.htm
Megan
who is always saving worms!!