Drive through the immediate neighborhood. If you want families, there ought to be swing sets. Inconvenience drives shoppers away. If drivers can't see your sign, they won't find your store. Long, skinny rectangles are hard to make inviting.
Most businesses prefer space that is wide rather than deep.
If you can't find that, then at least look for pie shapes or squares. The space may be perfect, but if you end up working just to pay the landlord, it's not a good deal. If you live in California, the rent in Kansas may seem low no matter what it is. Tour similar properties to make a reasonable comparison. U.S. Highway 1, North Palm Beach, Fl.