An authority may:
(a) Covenant as to the rents and fees to be charged in the operation of a housing project, the amount to be raised each year or other period of time by rents, fees, and other revenues, and as to their use and disposition.
(b) Create or authorize the creation of special funds for money held for construction or operating costs, debt service, reserves, or other purposes, and covenant as to the use and disposition of the money held in the funds.