The county planning commission in conjunction with the township boards of the affected areas shall investigate and determine the necessity of establishing districts and prescribing regulations therefor, as herein provided; and, for that purpose, shall consult with residents of affected areas, and with federal, state, and other agencies concerned. State, county, township, and city officials, departments, or agencies are hereby required to make available, upon request of the county planning commission, such pertinent information as they may possess, to render technical assistance, and to cooperate in assembling and compiling pertinent information.