Pretty new to the whole game development scene, but I have experience in other branches of programming. Anyway, I was wondering what methods are used to implement a skill structure. I imagine a skill in itself would a class. I'm using actionscript 3 for this project btw.

    	public class Skill
	{
		public var power:int;
		public var delay:int;
		public var cooldown:int;
		
		public function Attack(user:Mob, target:Mob) 
		{
			
		}
    		
    	}
    
    }

Each skill would extend the Skill class and add it's own functionality.

    	public class Tackle extends Skill
	{
		
		public function Tackle(user:Mob, target:Mob) 
		{
			super(user, target);
			executeAttack();
		}
		
		private function executeAttack():void 
		{
			//multiply user.strength with power etc
			//play attack animation
		}
		
	}

    }


This where I get stuck. How do I termine which mobs has which skills? And which skill will they later be able to retrieve (by reaching a certain level etc).
How does the player actually execute the skill and how is it determine if it hits. It's all very new to me so I have no idea where to begin. 
Any links would also be appreciated. 
Thanks in advance.