ActionScript 3 - Need help for my small game (2 Questions)

Hello all,

I am a new member here. Greeting to everyone.

Well I am working on a small game in which objects come flying towards the target ship and they have to dodge using Up and Down arrow.

The first problem is when the player clicks start and game jumps to the 8th Frame.
The object(alien ship) only moves when we click on the background once.
i.e The player is unable to move the spaceship as soon as the game starts, they can only do that after they click on the background once.

The second thing I wanted to enquire about is how to jump to another frame or scene when my score reaches a certain point.
I am using these scripts in AS3, but unfortunately I do not understand them.

txtPoint.text = point.toString();

point += 10;

txtPoint.text = point.toString();

Any help would be deeply appreciated. ^_^