Create 4 MC's which fades in/out and moves

I’m new to ActionScript 3 and would love to se a code-example for my problem.

I have a stage which is 100 % in height and width according to the browser.

In my library I have a MovieClip which has the identifier “Line”.

I would like to create 4 MovieClips with “Line” with the height 100 %, fade them in and out slowly while moving them either to the left or to the right. And each MovieClip should be placed randomly on the stage. After each fade-out the MovieClip should fade-in again, but again on a randomly place at the stage.