2d Game how to make Health And Gameover script

2d Game how to make Health And Gameover script a 3 life kind Of health and can it connect to my Reset script

using UnityEngine;
using System.Collections;

public class Reset : MonoBehaviour {

public AudioClip die;
AudioSource aScorce;
GameObject obj;
// Use this for initialization
void Start () {
	obj = GameObject.Find ("AudioObject");
	if (obj != null)
		aScorce = obj.GetComponent<AudioSource> (); // get component once @ Start more efficient.

}

// Update is called once per frame
void Update () {

}

void OnTriggerEnter2D (Collider2D other)
{
	if (other.gameObject.CompareTag("Player"))
	    aScorce.clip = die;
	    aScorce.Play ();
	if (other.gameObject.CompareTag("Player"))
	Application.LoadLevel(Application.loadedLevel);
}

}

Give a sample pls