I'm in the US, but I can tell you how it's done here. My friend opened a bread baking business out of her home.
She had to have a health inspection first. They look for any signs of bugs, peeling paint, the house has to be in pretty good condition, the kitchen has to be clean, and you can't have any pets in the house. (no dog hair in the food)
She also had to get a second oven, which required an electrician to come and change her voltage to a higher level, which professional kitchens have.
After she had her license and inspections, and insurance, then she designed her labels (stickers) and you have to legally list every single ingredient in there. Some people are allergic to peanuts, so you have to have a disclaimer if you do make cookies or whatever made with peanut butter. Otherwise, you can be sued.
So she designed her labels, bought the clear plastic bags online, and worked out pricing. Most people who have small businesses tend to underprice themselves, so just tip, don't sell yourself short. Decide if you will only accept cash, or if you will accept credit as payment too.
Make a list of potential customers. Grocery stores, restaurants, special events such as fairs and festivals. Make a website, and if you can't afford a website, do a Facebook page for your business and put that link on your business card. Bring samples of your products around to potential clients so they can taste it, and leave your business card with them. Follow up within a week to see if they would consider using your business.
Good luck to you! :)
small business owner