Try these:
http://www.azda.gov
www.azdhs.gov
However, I don't think you will get an answer you want...that is to be able to have one! You can also contact the local Health Department.
In Maricopa County everything is handled by the Environmental Health Division. Here is their website: http://www.maricopa.gov/EnvSvc/EnvHealth/
If you are bored, you can read Chapter 8 of the Health Code here: http://www.maricopa.gov/EnvSvc/AboutUs/HealthCode.aspx
If you don't feel like reading it, I can tell you that commercially selling food products made in a private residence is not allowed.
FWIW, There are literally hundreds of people in the Phoenix area doing it, and many of them advertise everywhere, so while the ENVSC prohibits it, they don't actually care or enforce their rules.
Of course, I'm not encouraging anyone to break the law and risk fines etc should you get busted, I'm just stating facts. 
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