The administration of said fund, except as the same relates to the custody and investment of the fund, shall be entrusted to the Retirement Commission, which may employ actuarial, clerical and other assistance necessary for the purpose and which may make reasonable regulations for carrying out the provisions of this part including designation of the times at and manner in which the participating municipalities shall make the several payments required by this part. Each participating municipality shall furnish, at such times and in such manner as the Retirement Commission directs, information concerning the names, ages, length of service and pay of members employed by such municipality and any other data which the Retirement Commission determines to be necessary for the proper execution of this part and to give prompt notice of all appointments, removals, deaths, resignations, leaves of absence and changes in pay of members.