you have to be 18 to smoke there, they can be pretty strict at times but if you look around 18 and dont act like a dick you'll probably be fine.

Coffeeshops are like normal coffeeshops only you can buy weed at the bar (and the decor is normally really cool!). Your not supposed to smoke on the streets or in open public places, but it's pretty open in the coffeeshops... you can sit outside the shops and smoke.

There have been loads of threads about this....search the thread titles for Amsterdam or somthing