The State Department of Veterans' Affairs shall have complete charge and control of the payment of the bonus authorized in this chapter and may adopt general rules for the making of such payments, the ascertainment and selection of proper recipients of the bonus and the procedure for applying for and receiving bonuses. The State Department of Veterans' Affairs shall adopt general rules for determining the question of whether an applicant possesses the prerequisite qualification of residence in the State of Alabama at the time he entered the armed forces and such department shall prescribe by rule the nature of proof to be submitted to establish such facts as are necessary to claim the bonus provided for by this chapter.