You can buy it in almost any gas station, grocery, convenience store. You pick 6 numbers (no repeat) form number 1 to 49. You can also let the machine pick randomly. The cost is $1. If all your picks match the winning number, you may win millions dollars (The lottery seller would tell you the exact prize amount and the prize should be shared by all the winners since other person may pick the same number as you). The propability is about one over 14 million, which is much smaller than the propability of being hit to death by a car. If you have 5 numbers match the winning numbers, you can win about $200K (not very sure about the amount). Even you match 3 winning numbers, you still win $2. The lottery sellers, newspapers and TV publish the winning numbers. In the back of the lottery ticket, there is detail description about 兑奖. As I know, for small amount of money(<$1000), you can 兑奖 from any lottery seller. If the prize is bigger than $1000, you should go to their office or headquarter.