I am attempting to build an array that houses 3 GameObjects

Here is what I have so far, I am working with a program who is obvious clueless but I am trying to get a random spawn feature at a set location I have paired with a GameObject [Spawn point] Inside the engine.. Just having trouble getting it to function the way I want it to.

 var platforms : GameObject[];
 var platformSpawn : Transform[];
 var platformSpeed : float[];
 
 
 function Spawn() {
 
 }    
     
     
 
 function Start () {
 
 }
 
 function Update () {
 
 if(Random.value <=.7)
  instace = Instantiatte(game_cube, spawn.position, spawn.rotation);    
 }