Where do you include your rent for an apartment?

RENT

There is not a rent deduction or credit on your Federal return.  If your state has anything for renters you will be prompted to enter your rent info when you complete your state return.  As far as I know, the states that have anything for rent are Arizona, California, Connecticut, Hawaii, Indiana, Iowa, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, New Jersey, Rhode Island, Vermont, and Wisconsin.

I live in Michigan, what line should I include this in in my state?

I do not know what the MI form looks like.  Just go through it carefully.  Most state forms are pretty easy.