The commission shall as necessary adopt rules on:
(1) an application for the establishment, maintenance, and termination of a group account authorized by this subchapter;
(2) the type of records to be kept and reports to be submitted by a group of employers;
(3) the addition of a new member to a group;
(4) the withdrawal of an active member from a group; and
(5) the determination of the amount of reimbursements payable under this subchapter by members of a group and the time and manner of those payments.