(a) A warrant or note issued under this subchapter is a lien on:
(1) the revenue of the municipality for the fiscal year during which the warrant or note is issued that is available for payment of the warrant or note; or
(2) a designated portion of that revenue.
(b) A municipality shall pay a warrant or note:
(1) consecutively according to its respective date and number as money for payment becomes available; or
(2) on a date during the fiscal year on which, in the estimate of the governing body, sufficient revenue will be available for payment of the warrant or note.