How to become a medical marijuana vendor for dispensaries?

I live in California and have a medical card. I'm getting into growing and I was wondering if someone with some knowledge could give me some basic info. Could you just go into a club with a sample and ask them if they want to buy from you? How much are clubs looking for, for example are they looking for just a few pounds every crop or much more than that, like in the 20-30 range? Any info would be greatly appreciated. Don't post if you don't know what your talking about please. And be honest, if it's a shady, cutthroat business like I think it might be, than tell me. Thanks.
 
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