Within 30 days after a majority of the voters of the county voting upon said question elect to come within the provisions of sections 383C.03 to 383C.059, the board of county commissioners shall by majority vote, appoint three persons as county civil service commissioners to serve for designated terms of one for two years, one for four years, and one for six years. Each alternate year thereafter the board of county commissioners shall appoint one person as successor for the county civil service commissioner whose term shall expire, to serve six years. Any vacancies shall be filled by the board of county commissioners for the unexpired term. No person shall be appointed or shall act as a member of the county civil service commission at any time while holding any public office or while standing as a candidate for any public office, notary public excepted, or any public employment or position in a political party within the two years immediately preceding appointment. Each member of said commission shall be a resident in the county and on becoming a nonresident, thereby forfeits the office. Within 15 days after appointment, each commissioner shall qualify by subscribing to an oath for the faithful discharge of duties and file said oath with said court administrator of the district court and such oath shall include a statement of belief in and desire to support the principles of the merit system. If an appointee fails to so qualify, another shall be named. Each commissioner shall hold office until a successor has been appointed and qualified, except in case a commissioner shall stand as a candidate for elective public office, whereupon the filing of candidacy thereby automatically results in forfeiture of the office. The county civil service commission shall organize by electing one of its members as presiding officer and the civil service director hereinafter provided shall serve as secretary.