Members of the board shall meet in the office of the county attorney upon the call of such officer as soon after their qualification for office as possible and shall organize by electing a chairman and vice-chairman. Thereafter, the board shall meet at least once each month in public session at a time and place which shall be fixed by resolution of the board. Such resolution may specify that any regular meeting may be adjourned to another time and place. Special meetings may be called at any time by the chairman or by joint action of any three (3) members of the board and they may be held at any public building within the county. Written notice, stating the time and place of any special meeting and the purpose for which called, shall be given each member at least two (2) days in advance of said meeting, and no business other than that stated in the notice shall be transacted at such meeting. Three (3) members of the board shall constitute a quorum for the purpose of conducting any business, and the vote of three (3) members shall be required for the passage of any motion or resolution. No member of such board shall be permitted to pass or to abstain from voting upon any measure properly before the board except upon the basis of a conflict of interest announced by such member and made a part of the record of the meeting. The chairman, and in his absence or disability, the vice-chairman, shall preside at all meetings and sign or execute all orders, contracts or documents of any kind required or authorized to be signed or executed by the board. The board shall cause a proper record to be kept of its proceedings and is authorized to appoint a secretary of the board.