{C#} spawning a list of objects in order and not at randaom

Hi, I am trying to create a list of objects to be spawn right in front of the character. Almost like an infinite runner but I don't want it to be infinite, I wan to control the prefabs so I can load the "finish line" at the end and not at random.

I managed to create a script that spawns my prefabs and recycles them when not in view (by following some tutorials online). I have no idea how to change the code to make it so its not random anymore. I have tried to mess with it but I only make things worse.

I am attaching the script. Any help would be appreciated.

Thanks for your time

Code (CSharp):

1. using UnityEngine;
2. using System.Collections.Generic;
3.  
4. public class PlatformManager : MonoBehaviour {
5.    
6.     public Transform[] platformlist;
7.     public int numberOfObjects;
8.     public float recycleOffset;
9.     public Vector3 minSize, maxSize, minGap; //maxGap;
10.     private Vector3 nextPosition;
11.     private Queue<Transform> objectQueue;
12.    
13.  
14.     void Start () {
15.         GameEventManager.GameStart += GameStart;
16.         GameEventManager.GameOver += GameOver;
17.        
18.         objectQueue = new Queue<Transform>(numberOfObjects);
19.         for(int i = 0; i < numberOfObjects; i++){
20.             objectQueue.Enqueue((Transform)Instantiate(platformlist[Random.Range(0, platformlist.Length)]));
21.         }
22.         nextPosition = transform.localPosition;
23.         for(int i = 0; i < numberOfObjects; i++){
24.             Recycle();
25.         }
26.     }
27.  
28.     void Update () {
29.         if(objectQueue.Peek().localPosition.x + recycleOffset < Runner.distanceTraveled){
30.             Recycle();
31.         }
32.     }
33.  
34.     private void Recycle () {
35.         Vector3 scale = new Vector3(
36.             Random.Range(minSize.x, maxSize.x),
37.             Random.Range(minSize.y, maxSize.y),
38.             Random.Range(minSize.z, maxSize.z));
39.        
40.         Vector3 position = nextPosition;
41.         position.x += scale.x * 0;
42.         //position.y += scale.y * 0f;
43.        
44.         Transform o = objectQueue.Dequeue();
45.         o.localScale = scale;
46.         o.localPosition = position;
47.         objectQueue.Enqueue(o);
48.        
49.        
50.         nextPosition += new Vector3(
51.             Random.Range(minGap.x, minGap.x),
52.             //Random.Range(minGap.y, maxGap.y),
53.             Random.Range(minGap.z, minGap.z));
54.  
55.         //if(nextPosition.y < minY){
56.             //nextPosition.y = minY + maxGap.y;
57.         //}
58.         //else if(nextPosition.y > maxY){
59.             //nextPosition.y = maxY - maxGap.y;
60.         //}
61.  
62.     }
63.    
64.     private void GameStart () {
65.         nextPosition = transform.localPosition;
66.         for(int i = 0; i < numberOfObjects; i++){
67.             Recycle();
68.         }
69.         enabled = true;
70.     }
71.    
72.     private void GameOver () {
73.         enabled = true;
74.     }
75. }