Each marketing agreement and order shall be administered by the Commission with the advice and approval of a commodity board. For these purposes there shall be included in each order, and may be included in each agreement provisions for the employment of such additional personnel, including attorneys engaged in the private practice of law, subject to the approval and supervision of the Attorney General as determined by the commodity board and the Commission to be necessary and proper. Such provisions may provide for the qualifications, method of selection, term of office, grounds of dismissal, and the detailed powers and duties to be exercised by such additional personnel as may be employed.