I think CA is the only state that has the dispensary license thing so far of all 13 states that have medicinal laws. I think the best and most legal way would be to petition your local government and come up with a proposal for dealing with licensing of growers and overall distribution of medicinal cannabis.

The downside is that there is nothing set in stone as far as dispensaries unless you are in CA, at least as far as I know, so to open a dispensary to openly sell marijuana is pretty risky anywhere other than a few key spots in CA.

Hopefully someone else will have better information from their own experience. However, I am pretty sure it starts with the people submitting their own ways to establish legitimacy since the states have more or less chosen to stay out of regulation of this new and misunderstood industry.