create variable trouble

I get this error, "Assets/scripts/scripts/Shoot.cs(6,17): error CS0825: The contextual keyword `var' may only appear within a local variable declaration"

 using UnityEngine;
 using System.Collections;
 
 public class Shoot : MonoBehaviour 
 {
     private var ShootActive = false;
     
     void OnMouseDown ()
     {
     
     }
     
     
     void Update () 
     {
     
     }
 }

This is the script i am writing so far, i am trying to crate a variable that when active an object spawns on the empty that this script is attached to. I want an if statement in the OnMouseDown area that says "when ShootActive = true spawn object and when ShootActive = false do nothing" but i don't know how to write this Thanks for any help i get, please don't just say i can't do this with an if statement and i need to use something else. I need an example script or a script written to fit this one. Thanks