infinity jump michanices

am doing infinity jumping game style but i cant do several thing :

first make coins randomly appear , i use thing but still nothing

<img src="http://i.imgur.com/V4DEjuK.png" border="0" />

second make the platform randomly but in a wave way

an example of this

dl.dropboxusercontent.com/u/62993408/super%20action%20hero%20infinity%20jump.mp4

and here is the capx

dl.dropboxusercontent.com/u/62993408/jumping.capx

thanx