Ok, first off, you have it a little mixed up.
You need to see a doctor first, who may or may not be at a clinic with other doctors. One clinic we reccomend is Pacific Support Services, they can get you a reccomendation for using Medical Marijuana, they will NOT, however sell you or give you any Marijuana. Be sure to bring information on your condition and previous medical records or prescriptions if you have any.
See this link for the address and information about Pacific Support Services:
http://www.420times.com/forums/medic...-services.html
Once you have your doctors reccomendation, you need to head down to one of these places to buy your medication, and most of them have deals on marijuana for first time visitors.
http://www.420times.com/forums/los-angeles-california/
BE SURE TO TELL THEM YOU HEARD IT ON 420 MAGAZINE!