Point in a right direction

I am making a miniature Zelda Link to the Past like Hack and slash game. This is my first Flash project, and I hope I didn’t bite off more then I could chew

I have my little hero moving around, and depending on where he is on the
stage the background will move instead, to make sure the hero is almost always in the center.

I am having problems when I am adding enemies though. I have them as a separate class, added as a child to the stage. I am trying to find a way to make them move when the background does also, but I am still confused on the way interactions between classes work.

I have a Hero class, Background class, Enemy class and a collision class.
If you need more clarification then I can try to give some. I just need a point in a right direction.