Top selling goods and services in Orange County Ca

I am formulating my business plan for a new business startup, and am completing my research.  I would like to know where to go to find out

what the top selling goods and services are in California, ( their ranking,

and in Orange County in particular). I have tried to get the information from

libraries, the Governor's web site, and the cities of Irvine, Tustin, and Anaheim.  Please respond here, or to projobs2008@yahoo.com with any information.