You don’t. I will share an article with you to help explain why that tells you how but will help you understand that you need a pro. https://www.thisoldhouse.com/ideas/ground-foundations
I agree with Jason. You don't. You need pros. They must meet building codes. A structural engineer determines the type of foundation, concrete density, structural density, etc., for the structure.
I also agree with Jason. A house is too important to not use a professional. You want a home to last for a lifetime of several families over the years. It's not a DIY project. Good luck.
Cardboard staple the cardboard any kind and fill to your liking