If that link doesn't work, go to http://www.apta.org. Click "Information for Students" on the left-hand side. Then select "Careers in Physical Therapy." Then click "Search Accredited PT/PTA Programs" on the map on the right. Select "PTA" as "Program Type" at the top of the map. Then click "Michigan."
The APTA website has a lot of good information on careers. Also check the PT Magazine area of the website (from the home page, select "Publications," then "PT Magazine." There's a regular column "PTA Viewpoint," as well as a regular column "This Is Why" about how and why people chose to become PTs or PTAs.
Hope that helps.