There are some fantastic documentaries out there, as well as doc-series available. As for obtaining a legal pres:cription, that's for you and your doctor.
The first step is having a qualified health professional on board with your descision. Once you have a pres:cription, the choice is yours where to procure your medicine. Health Canada makes available their list of licenced LEGAL health Canada producers.
The blank medical document is also available on the health Canada site. Once filled out, you mail your original doc away to the producer you've chosen and they will guide you through the registration process.
There are links to the producers different websites so you can look over them all before selecting one.
As I mentioned though, the first step is with your family doctor.
Good luck! It can be daunting wading through all the info, if you have any questions, I'd be happy to help if I can