Before issuing any warrant to any deputy for his salary, the supervisor shall require such deputy to take and subscribe an oath that he has fully and faithfully performed during the preceding month the duties required of him herein. The governing body of the county shall furnish to each such deputy two uniforms per year, to be prescribed and approved by such body. Such deputies shall provide themselves with deputies’ billies and such firearms as may be prescribed by the governing body of the county. They shall bear all expenses incident to their service.