After the issuance of a certificate of authority, the commissioner shall be empowered to issue orders or to publish regulations necessary for the proper enforcement of this chapter that the commissioner deems to be in the public interest. The published regulations of the commissioner shall have the effect of statute, and shall include, in particular, powers of regulating the form of subscription contracts and requirements of the contracts and prohibited provisions in the contracts, and all other matters requiring further definition or clarification within the requirements of this chapter. The commissioner has the authority to regulate rates as required by statutes now in force or hereinafter enacted by the general assembly.