(a) The revenue commissioner, at his or her discretion, may mail an application for renewal of motor vehicle licenses to whom such license has been previously issued, such renewal forms required to be returned prior to the expiration date of the license. Such renewal forms may be in postcard form and with sufficient information thereon to adequately identify and process such renewal. The signature of the licensee thereon and proper remittance shall constitute sufficient authority for the judge of probate to issue such license and the revenue commissioner to return to the licensee by mail. There is hereby established a fee to be entitled mail order fee which shall be set, from time to time, by the county commission to pay the cost of the mailing procedure herein provided, and such fee shall be collected by the revenue commissioner at the time of issuance and paid over to the general fund of the county as are other fees and commissions. Nothing in this section shall affect the responsibilities, fees, or compensation of the judge of probate.

(b) The county commission shall insure that the revenue commissioner has sufficient staff and shall provide such clerks and other assistants for the revenue commissioner as shall be necessary from time to time for the proper and efficient performance of the duties of his or her office. The revenue commissioner shall have authority to employ such clerks and other assistants and to fix their compensation. The number and compensation of such clerks and other assistants shall be subject to the approval of the county commission.