I built room on the side of the house, I worked with a journey man and everything he taught me as he gave orders, wrote blueprints I could confirm with sources

I built room on the side of the house, I worked with a journey man and everything he taught me as he gave orders, wrote blueprints I could confirm with sources online. It's a wonderful idea to build something using modern techniques. There is a joke in engineering about the architect that doesn't know how to use a hammer. I would be happy to generate a plethora of links to resources if you like? What is the climate for the structure? What is the ground like, rock or sand? Concrete molds are available at any mainstream hardware store or supply store. Are you sure you would use concrete above the basement and ground floor? That is heavy and it takes a while to warm and cool it which can be a benefit or a problem.