Sorry my messages keep timing out before I can edit them. To answer the OP, probably the easiest way to get exposure as a caregiver is to attend one of the caravan conventions that rove the state signing up people for their cards. They allow caregivers to set up at the conventions and show their wares / offer their services. I believe this is free on a first come first served basis for table space.

MCN - Providing Free Resources to the people of Montana about Medical Marijuana