Spawn random enemy on random position

I have a few kind of enemy in my folder prefab. Also, i have 8 kind of position

i want to spawn random enemy with random position. But i cant understand, how initialize some kind of enemy from my folder “prefab”

    Vector2 botVector = new Vector2(0f, -13.8f);
	Vector2 botLeftVector = new Vector2(-14.8f, -8f);
	Vector2 leftVector = new Vector2(-16.3f, 0f);
	Vector2 topLeftVector = new Vector2(-11.2f, 6f);
	Vector2 topVector = new Vector2(0f, 8.6f);
	Vector2 topRightVector = new Vector2(12.2f, 5.2f);
	Vector2 rightVector = new Vector2(15.8f, 0f);
	Vector2 botRightVector = new Vector2(13.6f, -8.4f);
	Vector2[] allVectors = new Vector2[8];
	int randomPosition;

	void setupVectors() {
		allVectors [0] = botVector;
		allVectors [1] = botLeftVector;
		allVectors [2] = leftVector;
		allVectors [3] = topLeftVector;
		allVectors [4] = topVector;
		allVectors [5] = topRightVector;
		allVectors [6] = rightVector;
		allVectors [7] = botRightVector;
	}


	// Use this for initialization
	void Start () {
		setupVectors();
	}
	
	// Update is called once per frame
	void Update () {
       randomPosition = Random.Range (0, allVectors.Length);
	}

using UnityEngine;
using System.Collections;

public class EnemyCreation : MonoBehaviour {
	public GameObject[] EnemyPos;//Array in which Enemy Positions reside
	public GameObject[] Enemies ;
	int NoOfEnimies;
	public GameObject InstaniatedEnemy;
	// Use this for initialization
	void Start () {
		NoOfEnimies = 10;
		EnemyPos= new GameObject[NoOfEnimies];
		Enemies = new GameObject[NoOfEnimies];
		for(int  i=0;i< Enemies.Length;i++)
		{
			Enemies *= Resources.Load("/EnemyPrefabFolder/Enemy"+i);*
  •  }*
    
  • }*

  • // Update is called once per frame*

  • void Update () {*

  •  if(Input.GetKeyDown(KeyCode.Return))*
    
  •  {*
    
  •  	InstaniatedEnemy = (GameObject) Instantiate(Enemies[Random.Range(0,10)],EnemyPos[Random.Range(0,10)].transform.,Quaternion.identity);//Random Enemy Gets Instantiated at at Random Position when user presses"Return" Key* 
    
  •  }*
    
  • }*
    }
    Attach this Script to Main Camera or any Empty GameObject.
    Note: Code is untested.