Go to the National Board Web site (nationalboard.org)order the Code, review the Quality Manual requirements therein and develop your manual based on those requirements and the way you conduct your business. Whereas you must have an AIA under contract, utilize its personnel to review and comment upon your Manual. Then apply to the Board for the joint review audit.
$15,000 does not appear too much if they will write/develop your Manual together with your company's reps.