Kia Ora.
Great suggestions above and I would add that getting a really clear process for tracking and managing product costs, so you know what your products cost you, and can price them to make money (important part of a side hustle!).

And second a program such as Foodworks so that you can work out the nutritional composition of the foods and deliver the packaging requirements to meet NZ legal standards. This is a really important element of your product offer to get right, especially around any claims, allergens, meeting legal requirements for pack weight declarations for example.

Good luck!