Welcome to the community.
You have a great idea there, and probably more enthusiasm than skill. That’s fine. The first rule is, Start Small.
First you need to familiarize yourself with the tools. Learn-as-you-go. Start with a simple map of a property. Your house, your neighbor’s, a fictional house, whatever. Just enough so that you’re not in over your head from the start. From there, you can expand out to a neighborhood, city block, etc.
Good luck!