How to spawn a gameobject with a component and keep track of it

ActorManager

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class ActorManager : MonoBehaviour
{
	public Actor actorPrefab;
	public List<Actor> actors = new List<Actor>();

	void Start()
	{
		Actor actor = (Instantiate(actorPrefab.gameObject, Vector3.Zero, Quaterion.Identity) as GameObject).GetComponent<Actor>();

		//do anything to actor

		actors.Add(actor);
	}
}