Each ordinance, agreement, or resolution creating an authority shall include the following:
1. The name of the authority and address of its principal office;
2. The name of each participating locality, together with the names, addresses, and terms of office of the first members of the board of the authority;
3. The purpose for which the authority is to be created, insofar as the governing bodies of the participating localities determine to be practicable; and
4. The number of members who shall exercise the powers of the authority and the number from each participating locality pursuant to § 56-484.18:5.