The best license is the license that allows you to purchase vehicles from wholesale (dealer only) auctions and sell to the public such as to your family and friends.

Register your business with the local authorities and obtain a business license or tax certificate. Register with the California Department of Tax and Fee Administration. Obtain a seller's permit to collect sales taxes from customers and remit them to the state. Open a bank account in the name of your business.

Is there an Auto Broker license or endorsement? Yes! You can refer with this link: https://www.dmv.ca.gov/portal/handbook/vehicle-industry-registration-procedures-manual-2/general-information-licensees/autobroker/#:~:text=2.010%20Autobroker%20(CVC%20%C2%A7166)&text=A%20dealer%20may%20not%20engage,endorsement%20to%20their%20dealer's%20license

Any other license required like salesman license? Yes salesman license required. You can refer with this link: https://www.dmv.ca.gov/portal/vehicle-industry-services/occupational-licensing/occupational-licenses/vehicle-salesperson-license/

Office Space Requirement: Yes. Retail Dealers are required to have a commercial office dedicated to their dealer business, a two-foot square sign with your name and address posted permanently outside, and a display area. The display area must be large enough for at least one vehicle and reserved as a “Display Area Only.”
Display Space Requirement: The display area must be clearly for the exclusive use of the dealer for display purposes only. Additional display areas are permitted within a radius of 1,000 feet from the principal place of business and any licensed branch location without being subject to separate licensing.

Required Office Hours: It could take up to 120 days to process your CA Dealer License Application and run a background check. The CA DMV lets you check your license status. Your place of business will need to be inspected by an Occupational Licensing Inspector before you can be granted a California Dealer License.
Pre-site Inspection or Zoning Certificate? An auto wholesale dealer (new or used) is allowed in the A and R zone as home occupation business provided conditions in the Los Angeles Municipal Code section 12.05. A.

For help finding a startup location, go to www.dealerspace123.com

The first step is to take the Dealer Pre-License Training Class. This program is approved by the DMV and required to get your California Dealer License: https://dealer101.com/california-dealer-license/

Links to preferred Pre-licesing educators: http://www.onlineautodealered.com/

http://www.cadeclasses.com/

You can refer to this link: https://www.sos.ca.gov/business-programs/business-entities/forms

To apply for your Employer Identification Number (EIN), visit the IRS website. It's FREE to apply.

You may need these numbers: NAICS Code for Used Car Dealers 441120 and SIC Code 5521.

For help incorporating your business to sell cars, go to www.autodealerbschool.com/recs

To apply for a retail used car license, you are required to have a surety bond and garage liability insurance.

Here is a list of preferred providers www.autodealerbschool.com/recs

To apply for the retail license, you must complete all the requirements and submit a paper application.

For help submitting your application, join Drama Free Licensing VIP.
Click here for details: www.autodealerbschool.com/DFL

The board rules will have all the laws that govern auto dealers, you can find them at: https://ir.law.fsu.edu/cgi/viewcontent.cgi?article=1632&context=lr