No California expertise, just answering because no one else did.
I would guess that Googling search terms like "CPA small business California", "CPA California form of business", "CPA California business formation", and "business formation attorney California" would help to find practitioners with expertise. And that you'd narrow down the search results by reviewing their web pages, Yelping candidates that seem excellent, verifying through their state board that their licenses are current. Perhaps add a search term related to the specific business you wish to start, so you find practitioners who already know the industry.
But it's been over a week...you've probably done all that! So, good luck.