The department shall prepare a manual setting forth the powers, duties, and responsibilities of directors of county and citrus fruit fairs, and a separate manual setting forth the powers, duties, and responsibilities of directors of district and combined county and district fairs. The department shall also:
(a) Revise the manuals annually.
(b) Provide copies of the manuals to each director and manager of every county, district, combined county and district, and citrus fruit fair.