Best thing to do, being a contracor your lucky to have a craft background is to built a card or timber model. You’ll need a scale ruler, metal ruler, scalpel ( surgical blade) and cardboard/ foam board. Make a large 1:50 model and keep remaking and modifying it till its right. Computer models can look very contrived. Sketch up is a program but its only a tool. I know an architect who builds a full scale model of his buildings on site strawbales and timber to see where windows would frame views and how shafts of sunlight could illuminate the interior. Guess he never liked scale rulers.
but i would have to second wnhs post……. if you plan on doing this professionally then you should first seek out professional training and education. Its ok to mess about with design, but if you are going to provide a service and charge for it then you have lots of responsibilities.