Whenever the governing body of any such county shall determine that such rules and regulations are necessary in any area or section of the county or whenever the council, commission or other governing body of any municipality, incorporated community or water, sewer or public service district in the county shall determine that such rules or regulations are necessary in the territory comprised within its limits, it shall hold a public hearing, after notice thereof (describing the area or section) shall have been published in a newspaper of general circulation in the county at least once a week for three successive weeks, for the purpose of considering the necessity of such rules and regulations, the type, coverage and contents thereof and the exact extent of the area or section proposed to be covered thereby. At such hearing any and all interested parties shall be entitled to appear and be heard. After such hearing shall have been had, and not before, such governing body may provide and prescribe by resolution or ordinance the rules and regulations applicable to such area or section or to such municipality, incorporated community or water, sewer or public service district, as the case may be, as herein authorized.