To be a designated care grower you need one or more person with a Dr. note and they appoint you to be their care grower. You need a copy of their medical note from their Dr.

At this time a county or state ID card is not required. It may at some point in the future be required to register but not at this time. The state has stated that registered users may have their information shared with the Federal Gov if the Gov ask.

You can also volunteer to grow for any of the local Medical clubs as well. But keep in mind that the feds are raiding clubs to get their hands on the member list and the provider list imo.