Before the Commissioner takes any action under § 11-414 of this subtitle, the Commissioner shall give the licensee an opportunity for a hearing before the Commissioner. Notice of the hearing shall be given and the hearing shall be held in accordance with the Administrative Procedure Act. The hearing notice to be given to the licensee shall be sent by certified mail, return receipt requested, bearing a postmark from the United States Postal Service, to the principal place of business of the licensee in this State at least 10 days before the hearing. An order suspending or revoking a license shall state the grounds on which it is based and is not effective until 10 days after written notice of the order is sent to the licensee by certified mail, return receipt requested, bearing a postmark from the United States Postal Service, to the principal place of business of the licensee in this State. The Commissioner shall adopt rules and regulations for: The conduct of hearings; and The form of findings and orders.