Ticking clock and falling object

[beckdan]

How do i get the second hand of a clock to move every second? i am newbie to sp so please detail which kind of joint i would use to connect the hand to the clock face (motor?hinge?) and what settings i would put in the controller.
Also, how do i time an object to only begin falling when another object has reached a certain position. i am trying to make an animation whereby a door slams closed and an object that was attached to a nearby wall falls down when the door is closed.
Btw, if anyone is interested in a freelance job helping me with many more such animations, please send your info. i am willing to pay decently but the person should have knowledge of su, sp, and twilight.
Thanks