Before issuing any bonds as provided in this Division, the County Board shall adopt a resolution specifying the amount of bonds to be issued, the date, denominations, rate of interest and maturities, and fix all the details with respect to the issue and execution thereof, and shall levy a tax sufficient to pay both the principal of and interest upon such bonds as they mature. Such bonds issued in compliance with the provisions of Section 5-23023 hereof, shall mature at such time or times as the County Board shall fix, but not to exceed twenty years from date thereof. Any such bonds, the final maturity of which is within such maturity limitation heretofore mentioned in said Section 5-23023, shall mature at such times as the County Board shall fix within said maturity limitation heretofore mentioned. All of such bonds shall bear interest at not more than six per cent per annum, payable semi-annually, and shall be payable at such place as the County Board shall fix.