You did not mention where you are located so i just will leave you with a few tips.
Here is a link to more info about food sanitation..
https://www.servsafe.com/home
A couple of questions...
Does your State (or country) allow you to bake and sell food from home?
For example, Texas has a Cottage Food Law that gives us the right to sell certain low risk products from home as long as the producer follows safe kitchen practices., no Health Department visits unless they get a lot of complaints.
I would highly recommend you set up as a LLC, as if someone gets sick and decides to sue, you could lose your home, car...you get the idea, right?
Speaking of lawsuits, you will need to contact your ins agent and speak to him about your new venture. He can steer you in the right direction and will recommend the amt of coverage you will need.
Check with your local zoning board and ask if your location is ok for high traffic commercial/ business use.
Totally ignore the above if you are all set.
Congrats on your new venture...hope u make a million!