You are probably the 349,875,342nd person who has made this thread.
Once you can show residency (go to the DMV and get your DL, or ID card. Once you have that you can shop at Medical Marijuana Centers, or MMC's. You can grow your own 6 plants with 3 in flower and you can possess up to two ounces of the drug, and you have a severe enough condition you might get a higher plant count than 6, but don't count on having that holding up in court. Your medical marijuana card only gives you an affirmative defense if you are arrested and charged. It's not a get out of jail free card, it isn't a free pass to puff in the open or in your car, period.
If you are going the recreational route, you can't buy from retail shops until next year. You can find your own pot, but you are not allowed to purchase it, which is why you see all the ads for 'donations' for recreational pot. Personally I would stay away from that because there will be at least a 25-35% tax on recreational pot. So if you don't know anyone who has medicine they will share with you than you're on your own. You can grow the same 6 plants, but there are no regulations on limits of possession, so long as the usable product is kept and stored the same place it was grown.
There are pros and cons to going the medical route, and the same for the recreational crowd. Personally, if you are looking to move here to sell pot to make money, forget it. There have been thousands who have failed before you. Check out our local craigslist ads, they are full of overpriced, disease infested and overpriced meds, and that's what you can expect to compete against.
If you are looking to move here and make a million bucks in this industry, forget it. What are you bringing to the table?
If you're just another recreational user then invalid.com might be a better site. That's where the new cocky kids like to hang out.
Good luck.