Cube terrain with perlin noise

hi, iv made a script (JS) that generate a 20x20 terrain of cubes, with random hills using perlin noise.

but i have a few problems to solve and questions to ask:

when i generate the terrain again it gives me the exact same terrain, how would i make it automatically give me something else?

how would i make this infinite? how would i make it so when the player goes forward into the world the world would keep up with him? but still look normal (can i make something with chunks?)

how can i implement a seed system ware when you enter a seed you will get the same terrain every time?

sorry if it's a lot of questions...

the script: var size:Vector2 = new Vector2(20, 20); var height:float = 10.0f; var noiseStrength:float = 10.0f;

 private var perlinNoise;
 
 private var root:GameObject;
 
 function OnGUI(){
     if(GUI.Button (Rect(10, 10, 100, 30), "Generate")){
     Generate();
     }
 }
 
 function PerlinNoise(x:float, y:float){
     var noise:float = Mathf.PerlinNoise(x / noiseStrength, y/ noiseStrength);
     return noise * height;
 }
 
 function Generate(){
     Destroy(GameObject.Find("Terrain"));
     
     root = new GameObject("Terrain");
     root.transform.position = new Vector3(size.x/2, 0, size.y/2);
     
     for(var i:int = 0; i <= size.x; i++){
         for(var p:int = 0; p <= size.y; p++){
             var box:GameObject = GameObject.CreatePrimitive(PrimitiveType.Cube);
             box.transform.position = new Vector3( i, PerlinNoise( i, p ), p);
             box.transform.parent = root.transform;
         }
     }
     
     root.transform.position = Vector3.zero;
     print(PerlinNoise);
 }