Counting clicks and difficulty menu in AS3 - actionscript-3

Question

I'm really hopeless with flash but my course decided it was a great idea to introduce it so here I am struggling for days. Can anyone tell me what I'm doing wrong please???
I'm trying to make a counting game where the menu has 3 difficulties: easy medium and hard. For easy, I have to generate random coins from 5-10, medium 10-15 and hard 15-20.
Also I'm trying to have the coins counted so if the right number generated is reached a message pops up saying 'congrats'
this is what i have so far..:
import fl.motion.MotionEvent;
import flash.events.MouseEvent;
var Count:Number = 0;
coinz.addEventListener(MouseEvent.CLICK, fl_MouseClickHandler_3);
function fl_MouseClickHandler_3(event:MouseEvent):void
{
trace("Mouse clicked");
}
var clickCount:int= 0;
btnnumb.addEventListener(MouseEvent.CLICK,addClick);
function addClick(evt:MouseEvent):void{
clickCount++;
}
textarea.text="SCORE:"+clickCount.toString();
var minLimit:uint = 5;
var maxLimit:uint = 10;
var range:uint = maxLimit - minLimit;
var myNum:Number = Math.ceil(Math.random()*range) + minLimit;
trace(myNum);
var low:Number = 1;
var high:Number = 5;
var result:Number = Math.floor(Math.random() * (1 + high - low)) + low
stop();

Answer 1

You are a bit unorganized.
If you want to follow the best practice then you should forget about timeline (use classes)
But, you are in timeline... here is also a good practice to put all your variables and events declarations in the top of the script, and your functions after;
For random between 2 numbers you can use a function rand(min, max) is better.
so you can do something like this:
import fl.motion.MotionEvent;
import flash.events.MouseEvent;
stop();
//variables name should start with lower case letter by convention
var count : Number = 0;
var clickCount : int = 0;
var randNumber : int = 0; //define understandable variables name (not myNum)
//constant variables should be in upper case and words sparated by underline
var MIN_RAND_LIMIT : uint = 5;
var MAX_RAND_LIMIT : uint = 10;
coinz.addEventListener(MouseEvent.CLICK, onCoinzClick);
btnnumb.addEventListener(MouseEvent.CLICK, addClick); //again 'btnnumb' is bad name
function onCoinzClick(e:MouseEvent) : void {
trace("Mouse clicked");
}
function addClick(e:MouseEvent) : void {
clickCount++;
//don't need toString in concatenation
textarea.text="SCORE:" + clickCount;
}
function rand(min:Number, max:Number) : Number {
return (Math.floor(Math.random() * (max - min + 1)) + min);
}
//test
randNumber = rand(MIN_RAND_LIMIT, MAX_RAND_LIMIT);
trace(randNumber);
///
///the rest logic of your game...
///
Try as much as possible to be organized and you will find it more easy to work and to get better...
Now regarding your game here are some hints:
in first frame make 3 buttons (easy, medium, hard)
when the button is click modify the min and max, depends on the clicked button and go to next frame
in the second frame you will have your game play logic...
Hope it helps.