My recommendations are:
Become very familiar with Montana's medical marijuana act.
Check the schedule for Montana Caregiver's Network and set up a booth at their clinics if you are looking for patients.
Read this forum for grow info.
Remember that it's taking at least a couple of months for the cards (still waiting for mine) and that being a caregiver does not give you permission to use your product (you essentially are a pharmacist), unless you are a patient also.
Dennis in Kalispell