Cooldown Spells and Icons

Hello, Im new to unity3d. I want to make a rpg game but i dont know how to make the skill icon and the cooldown. Please help me :( my script:

using UnityEngine; using System.Collections;

public class SpecialAttack : MonoBehaviour { public Fighter player; public KeyCode key; public double damagePercentage; public int stunTime; public bool inAction; public GameObject partcileEffect; public int projectile; public bool opponentBased;

 // Use this for initialization
 void Start () 
 {
 
 }
 
 // Update is called once per frame
 void Update ()
 {
     if(Input.GetKeyDown(key) && !player.specialAttack)
     {
         player.resetAttackFunction();
         player.specialAttack = true;
         inAction = true;
     }

     if(inAction)
     {
         if(player.attackFunction(stunTime, damagePercentage, key, partcileEffect, projectile, opponentBased))
         {

         }
         else
         {
             inAction = false;
         }

     }
 }

}

if its not clear then you can go to this : http://pastebin.com/3R2NzrkC