Clear and legible scale drawings with description and dimensions of the proposed sign, the construction, size, height, number of signs, clearance, setbacks, kind of materials, method of illumination and screening of lighting, colors, and copy to be used on such structure. The site plan shall show the buildings on the premises upon which the structure is to be erected and maintained together with location, size, and types of existing signs on the premises where the proposed sign is to be located.