The governing body of a local government unit may express its intent to evidence debt as electoral debt, nonelectoral debt or lease rental debt. Action may be taken either by resolution, which may also provide for the submission of proposals to purchase any bonds or notes, or by ordinance. But neither bonds or notes nor lease, guaranty, subsidy contract or other agreement evidencing lease rental debt shall be authorized other than by the enactment of any ordinances required by this subchapter or, in the case of notes issued under section 8109 (relating to small borrowing for capital purposes), other than by adoption of the resolution required under section 8109.