Determine your business structure and legal name
Register your business entity with the California Secretary of State if required
Obtain a federal Employer Identification Number from the IRS if needed
Register with the California Department of Tax and Fee Administration if you will collect sales tax or have other tax obligations
Check local city and county licensing requirements
Apply for a local business license or business tax certificate with your city or county
Obtain any required zoning, health, fire, or environmental permits
Apply for any industry-specific state licenses or permits
Renew your business license and permits as required
Keep all required business records and tax filings up to date