Fishing Game Code ActionScript 2.0 to ActionScript 3.0 - actionscript-3

Question

I am trying to make a fishing game where each fish you catch gives you a point and different enemies subtract points. I have found a tutorial for this in ActionScript 2 but I can't find any for action script 3 (here is the link to what I want to replicate: http://www.flashkit.com/tutorials/Games/Creating-Imtiazur-1297/index.php). I am relatively new at action script as I have only made animations before but I was able to do a little but then couldn't figure out the rest.
I currently have the fishing line moving up and down and does not go beyond the fishing line but I'm not sure how to make the line get longer when it goes down. At the moment the whole line and hook move with a space between it and the rod. I also have to click before the line moves (I'm not sure how to make it instantly usable when going to the frame). I also have one fish moving across the screen. I don't know how to make multiple of the same fish or enemies going across the screen at the same time.
Any help would be greatly appreciated​!
fish.addEventListener(Event.ENTER_FRAME, fl_AnimateHorizontally);
function fl_AnimateHorizontally(event:Event)
{
fish.x = fish.x + 5; if (fish.x>1100)
{
fish.x = -100;
}
shark.x = shark.x + 7; if (shark.x>3500)
{
shark.x = -400;
}
jellyfish.x = jellyfish.x + 3; if (jellyfish.x>3000)
{
jellyfish.x = -100;
}
boot.x = boot.x + 5; if (boot.x>1500)
{
boot.x = -100;
}
barrel.x = barrel.x + 4; if (barrel.x>1600)
{
barrel.x = -100;
}
}
var upPressed:Boolean = false;
var downPressed:Boolean = false;
var leftPressed:Boolean = false;
var rightPressed:Boolean = false;
rope.addEventListener(Event.ENTER_FRAME, fl_MoveInDirectionOfKey);
stage.addEventListener(KeyboardEvent.KEY_DOWN, fl_SetKeyPressed);
stage.addEventListener(KeyboardEvent.KEY_UP, fl_UnsetKeyPressed);
function fl_MoveInDirectionOfKey(event:Event)
{
if (upPressed)
{
rope.y -= 10; hook.y -= 10;
}
if (downPressed)
{
rope.y += 10; hook.y += 10;
}
if (leftPressed)
{
rope.x -= 0; hook.x -= 0;
}
if (rightPressed)
{
rope.x += 0; hook.x += 0;
}
if (rope.y < 35)
{
rope.y = 35; hook.y = 100;
}
}
function fl_SetKeyPressed(event:KeyboardEvent):void
{
switch (event.keyCode)
{
case Keyboard.UP:
{
upPressed = true;
break;
}
case Keyboard.DOWN:
{
downPressed = true;
break;
}
case Keyboard.LEFT:
{
leftPressed = true;
break;
}
case Keyboard.RIGHT:
{
rightPressed = true;
break;
}
}
}
function fl_UnsetKeyPressed(event:KeyboardEvent):void
{
switch (event.keyCode)
{
case Keyboard.UP:
{
upPressed = false;
break;
}
case Keyboard.DOWN:
{
downPressed = false;
break;
}
case Keyboard.LEFT:
{
leftPressed = false;
break;
}
case Keyboard.RIGHT:
{
rightPressed = false;
break;
}
}
}