The township board shall provide for the manner in which such regulations, restrictions and boundaries of such districts shall be determined, established and enforced, and from time to time amended, supplemented or changed within the unincorporated territory. In order to avail itself of the zoning powers conferred by sections 65.650 to 65.700, the township board shall request the township planning commission to recommend the boundaries of the various original districts and appropriate regulations to be enforced therein. If there be no township planning commission the township board shall appoint a township zoning commission whose personnel, length of terms and organization shall be the same as provided in sections 65.650 to 65.700 for a township planning commission. Such zoning commission shall make a preliminary report and a proposed zoning order and shall hold public hearings thereon and shall afford persons interested an opportunity to be heard. A hearing shall be held in the areas of the township affected by the terms of such proposed order, public notice of which hearing shall be given in the same manner as provided for the hearing in section 65.662. Such notice shall state the time and place of the hearing and the place where copies of the proposed report and proposed zoning order will be accessible for examination by interested parties. Such hearings may be adjourned from time to time. Within ninety days after the final adjournment of such hearings the zoning commission shall make a report and submit a proposed order to the township board. The township board may adopt the order with or without change or may refer it back to the zoning commission for further consideration and report. In the preparation of its report and proposed zoning order the zoning commission may incur such expenditures as shall be authorized by the township.