For right now, immediately it is legal for anyone 21 and older to share cannabis or cannabis plants with another of age person. You can legally carry up to an ounce in flower and about 8grams in concentrates. You can have 6 plants growing in an enclosed private growing space at one time. At the current moment, there is nothing set up to monitor or govern the exchange of money between the two parties. So for right now, you can continue to go into your normal shops as you would. California wont start issuing biz licenses until Jan 2018. Theres a long time to go before you see a "legal" shop in California. Thats just some of the main points. In general, most of this prop has not been implemented yet, we’re all waiting to see how it will play out.