Here are a few sites that will help you, the first one is very important, (very good):
Kilns can be quite safe to use when you follow some basic precautions; however, kiln safety is a must. They do, after all, contain huge amounts of heat when in use. Because of the high temperatures, firing a kiln also does release volatiles into the air, many of which are toxic. Learn how to use your kiln safely.
- http://pottery.about.com/od/safetyinceramics/tp/kilnsafe.htm
- http://www.expertvillage.com/video/42829_clay-sculpturing-kiln.htm
This site has general information on kilns:
- http://www.hotkilns.com/buy-kiln.html