The answer to this question, if you are talking about being out and about on foot, is pretty much the same for any state. Read any OC adventure on the MI part of this board and you'll be good to go.
Now if are pulled over in IN (traffic stop) you do not have to inform the LEO that you are armed. If he asks you, then you have to tell him.
If your weapon is visible to the officer I'd recommend having your LTCH and license in hand when the LEO gets to your window- just to prevent drama for both of you.
We talk IN, OC at www.armstalk.com as well.