Second: Click on the "maps" in the header here, then click on open carry, then click on MI. It will give you a brief summery and links to the MI state law as pertains to OC.
Third, you did not state whether you had a permit from you previous state, or what that state was. A lot of states (like WA) have slightly different rules for OC if you have a pistol permit, or not, that is recognized by the state you are in. (MI here)