You can check the Washington Marijuana program to see about what it takes to get a card. If you do not qualify for any, which you probably do and do not even know you do. Any kind of pain, headaches continuing for at least 3 months straight you should qualify.
Look to see if you can be a Caregiver or even a Grower for a patient that can't grow for themselves. You can post a ad on Craigslist to see if any patients need a Grower. If you find someone, make up a contract to protect both parties involved.
But if you are going to abuse the program, I suggest not bothering with getting a card. Remember the Patients own the plants. If they want they can have a Sheriff go with them to the registered grow site and pick up there plants at any given moment. So you need to pay attention to your plant counts.