Before you start, gather these:

• A list of every SKU you plan to sell, including the brand name, product name, and any flavor variant.
• The FDA's Tobacco Product Search tool (search.tobacco.fda.gov).
• Your California Tobacco Retailer License number (if you have one) and your CDTFA account details.
• A record-keeping method—a spreadsheet or cloud doc works fine.

You'll also want to know your local county and city rules. Some places like San Francisco and Los Angeles have stricter flavor bans than the state. You can usually find these on your city or county's official website, or by calling your local business licensing office.