The authority shall determine the form of the bonds, including any interest coupons to be attached thereto, and shall fix the denomination or denominations of the bonds and the place or places of payment of the principal and interest thereon, which may be at any bank or trust company within or without the state. The bonds may be issued in coupon or registered form, or both, as the authority may determine. Provision may be made for the registration of any coupon bond as to principal alone or as to both principal and interest. Whenever the authority determines to issue its bonds, it shall call upon the Georgia Building Authority to render advice and to perform, as its agent, ministerial services in connection with the marketing of such bonds.