Enemy Spawns Projectile towards player

I want to make a boss patern with a corrotine, but i cant make the boss to spawn a clone of a rock prefab towards player. Sorry for my english, i know its not great :s

public class BossScript : MonoBehaviour {

 Player player;
 public GameObject rock;
 Rigidbody2D rigidBody;
 public int velocity;
 Rock spawn;
 Rigidbody2D rockRigidBody;
 // Use this for initialization
 void Start ()
 {
     spawn = gameObject.GetComponent<Rock>();
     player = gameObject.GetComponent<Player>();
     StartCoroutine(Patern());
     rigidBody = GetComponent<Rigidbody2D>();
     rock = GetComponent<GameObject>();
     rockRigidBody = rock.GetComponent<Rigidbody2D>();
 }
 
 // Update is called once per frame
 void Update () {
     
 }

 IEnumerator Patern()
 {
     yield return new WaitForSeconds(2);

     rigidBody.velocity = new Vector2(velocity * -1, 0.0f);
     yield return new WaitForSeconds(3);

     rigidBody.velocity = new Vector2(0.0f, 0.0f);
     yield return null;

     Rigidbody2D clone;
     clone = (Instantiate(rockRigidBody, transform.position + 1.0f * transform.forward, transform.rotation) as Rigidbody2D);
     clone.AddRelativeForce(new Vector2(1000, 0));

 }

}