You will start at home. Home office, home kitchen home , home , home.
But if you are doing it right (and it’s more than a hobby) you will outgrow home, andwill have two options:

Find finance for your own premises and production facilities

Get someone else to do production using your recipes and packaging. White Labeling this is.

And it’d back to those bleedin’ spreadsheets.

Do a spreadsheet to establish the cost of setting up on your own versus the points you give someone else by white labeling.  This should also (somehow) weigh in your skillstack. Are you better at organizing and production or are you better at marketing and managing?