French Firm CA Sales Tax Registration

I oversee a French-based company that is about to start selling into the United States, and we need to be properly registered for sales tax in California before our first invoice goes out. I’m looking for a U.S. tax professional—ideally someone who has already handled international sellers—who can guide me through the California Department of Tax and Fee Administration (CDTFA) process from start to finish.

Here is what I need:
• Confirm that our planned sales activities create sales-tax nexus in California and outline any thresholds we must watch.
• Collect the information and documents you require (French corporate details, EIN, etc.) and complete the CDTFA online registration on our behalf.
• Advise on the best filing frequency and explain how to add any product exemptions if they apply.
• Provide a concise, step-by-step cheat sheet so my accounting team knows when and how to file the first California return and remit tax correctly.
• Answer follow-up questions during our initial rollout period (email or short call, as needed).

Experience with non-U.S. entities and familiarity with CDTFA procedures is essential. Knowledge of Avalara, TaxJar, or similar platforms is a plus, as we may integrate one later.

We are already in the process to register but we have issue with EIN and need a full check of our legal tax in the US.

If you can help us get registered quickly and painlessly, I’d love to work with you.