The county planning commission may create and adopt rules for the transaction of its business and shall keep a public record of its resolutions, transactions, findings, and recommendations. The commission may appoint such employees as it may deem necessary for its work and may contract with planners and other consultants for such services as it may require and may incur other necessary expenses. The county planning commission and all third class counties may charge and collect a fee for any service it provides, but the fee must be established by rule. The expenditures of county funds by the county planning commission in all second class counties shall not be in excess of the amounts appropriated for that purpose by the county commission. The expenditures of county funds by the county planning commission in all third class counties shall not be in excess of the amount of fees collected by it and the amounts appropriated for that purpose by the county commission. The commission shall have such other powers as may be necessary and proper to enable it to perform the duties imposed upon it by law.