ATP does not offer a commercial multi only course, You are more than likely in a private multi course.
With CFI school you spend the first week flying and in ground school, COME PREPARED, read everything twice literally!! Then the 2nd week you have your intial,then your II, then your single CFI, im not sure how the single thing works but they can tell you.
And call there number 1800-all-atps, ask for gary, i was a 10 monther when he was a 90 dayer. He can help you out!!!