The Internet offers a wide variety of resources for growing marijuana as medicine. Of particular note is a book (available for free download) written by Todd McCormick entitled, appropriately enough, How to Grow Medical Marijuana.
Other resources for growing marijuana as medicine are presented by the American Alliance for Medical Cannabis website's section on growing your own medicine.
However, none of these resources specifically addresses the issue of growing medical cannabis in Montana. This website welcomes the contribution of wisdom on this subject by those who care to share their skills and experience.