You should check the government site about How to get a Medical Marijuana Card. You can get the links from Marijuana Laws, Medical Marijuana Card, legalize marijuana, Michigan Caregiver Medical Marijuana

As far as I know, you need to go to see a doctor, and ask the doctor if you are qualified to get a marijuana card. The doctor clinics list can be found at: Marijuana Clinics, Medical Marijuana Doctors, Medical Marijuana Doctor, Michigan Medical Marijuana Caregivers, marijuana pharmacy, marijuana treatment

If the doctor said yes, you should go to the government site, download and fill with the paper work, and send in with return receipt.