I want to have a cannon that infinitely fires after a certain number of time but my script crashes unity

Idk how to make a script wait like you can in the c# virtual studio console and when I try to load my script from what I could gather infinite loops crash unity. I think coroutines do something but I don’t understand them. Could you help me find how to fix my script and explain how the Wait part of the script works ;-;

using UnityEngine;
using System.Collections;

public class CannonScript : MonoBehaviour {

    GameObject prefab;
   public GameObject Cannon;
    public GameObject Bullet;
    public float Bullet_Foward_Force;
    void Start ()
    void Update ()
        for (int i = 0; i < 10; i++ )
            GameObject temporary_Bullet_handler = Instantiate(Bullet, Cannon.transform.position,                       Cannon.transform.rotation) as GameObject;

           Rigidbody Temporary_Rigidbody;

           Temporary_Rigidbody = temporary_Bullet_handler.GetComponent();

           Temporary_Rigidbody.AddForce(transform.forward * Bullet_Foward_Force);
           //I want to have a script wait here

           Destroy(temporary_Bullet_handler, 10.0f);

Your update script is going to attempt to do this process at least 30 times a second, it is going to cause a lot of issues off the bat, and your Destruction method should be an “oncollision” even attached to the bullet.

My suggestion is create a timer, or max bullet count, and make the Update script only instantiate x # of bullets at any given time.
Also you could create a simple timed offset in your Update script by just make an int variable like this.

int counter = 0;
void Update
   counter ++
   if (counter > 30)
      //do stuff
      counter = 0;