Create floor plan examples like this one called Boutique Floor Plan from professionally-designed floor plan templates. Simply add walls, windows, doors, and fixtures from SmartDraw's large collection of floor plan libraries.
This is a boutique store layout. I find this interesting because the featured sales are in font and the staple items like jeans or a suit is next to the cashier. I also appreciate them adding a bench outside of the fitting room.
Science of making your floor space sell more dollars per square foot. Underhill's original book on why we buy and the science of retail anthropology is still the best source to begin learning why visual merchandising is so important.