In addition to drawing your plan on graph paper, I suggest marking things on the floor or outside in the dirt to help you visualize your future home. (This assumes you’re building a small structure.) You can scratch an outline of your rooms on the ground with a pointed stick or use stakes to define the shape. You can do something similar indoors using masking tape, etc. for individual rooms. Twelve inch floor tile is particularly convenient in getting a quick feel for dimensions. You can even use cardboard, clothes baskets, etc. — anything that’s around the house — to show the position of furniture and other key elements. This process can be very helpful in visualizing actual sizes versus relying on just drawings.