First, the obvious, there are several websites devoted to assisting the formation of a booking agency or company if you initiate a web search of "starting a booking company" or "agency." Several of those sites charge for their services and set up features.
A fine resource to assist you in forming a booking company, conducting an assessment of potential competition in the business, preparing a business plan, locating any funding and financing you may need as well as legally filing as a business in California to protect you from personal activity and financial liability is SCORE, Counselors to America's Small Business at http://www.score.org SCORE provides free counseling by experienced volunteer business experts to assist you in your local area.
The California Secretary of State can assist you in filing forms to develop a California business to protect you personally from liability in your booking arrangements. That website is as follows:
I hope this information is helpful and responsive to your question. If you would like further clarification, please let me know.
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