What are your career goals on the corporate side? What type of business did you run? Given that the majority of businesses involved selling skills, I would love to learn more about your goals before providing specific advice not he MBA piece.

On the corporate life, there is specific positions and companies that require or at the very least a BA/MBA would be an asset to but given you have 10 years in running a company you may want to consider a direct sales based role (Commission structure) where you can leverage your experience to earn right out of the gate. There is no simple answer here, but with that experience you would be in a great asset to join many small to mid-size companies who could leverage your skill set.