Marketing orders and orders modifying or terminating existing marketing orders shall be promulgated by the director only after the director has done the following:

(1) Received a petition as provided for in RCW 15.66.050;

(2) Given notice of hearing as provided for in RCW 15.66.060;

(3) Conducted a hearing as provided for in RCW 15.66.070;

(4) Made findings and decision as provided for in RCW 15.66.080;

(5) Determined assent of affected producers as provided for in RCW 15.66.090.