Moviment and Spawn of AI

I wanna make an AI who at the start of the game chooses randomly a spawn point in the map to spawn. And then depending on the spawn point it is gonna movement to a certain point in the map around this spawn point.
Ex: Started the game, Ai chosed to spawn on spawn_point_1. Now it can only moviment to movement_point_1.1, movement_point_1.2, movement_point_1.3.
I made a code that does that. But it has some problems:
1 - The code only functions if I create a vector beforehand for the movements_points that a spawn point can access. So if I wanna use a lot of spawn points I have to go manually to the script create a new group of moviments_points. I wanna make It less time-consuming, but I don't know what to do.
2 - The ai is placed in a map that has elevations and objects, that it should notice and collide with. But, every time that I put a rigid body on the object nothing happens because I'm using movement points and spawn points. I tried to put gravity in the points, but it didn't work. The AI started grabbing the points and moving them all over the map.
Now I don't know how to resolve these bugs. Can someone help me?
Here the code that I used:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class Patrol : MonoBehaviour
6. {
7.     public float speed;
8.     private float waitTime;
9.     public float startWaitTime;
10.  
11.     public Transform[] moveSpot1;
12.     public Transform[] moveSpot2;
13.     private int randonSpot;
14.  
15.     public Transform[] spawnSpot;
16.     private int randonSpawn;
17.  
18.    
19.     void Start()
20.     {
21.        
22.         randonSpawn = Random.Range(0, spawnSpot.Length);
23.        
24.         Debug.Log(randonSpawn);
25.        
26.         transform.position = spawnSpot[randonSpawn].position;
27.        
28.         waitTime = startWaitTime;
29.        
30.         if (randonSpawn == 0)
31.         {
32.            
33.             randonSpot = Random.Range(0, moveSpot1.Length);
34.         }
35.         else
36.         {
37.            
38.             if (randonSpawn == 1)
39.             {
40.                
41.                 randonSpot = Random.Range(0, moveSpot2.Length);
42.             }
43.         }
44.        
45.     }
46.  
47.     void Update()
48.     {
49.        
50.         if (randonSpawn == 0){
51.            
52.             transform.position = Vector3.MoveTowards(transform.position, moveSpot1[randonSpot].position, speed * Time.deltaTime);
53.          
54.             if (Vector3.Distance(transform.position, moveSpot1[randonSpot].position) < 0.2f) {
55.                
56.                 if (waitTime <= 0) {
57.                    
58.                     randonSpot = Random.Range(0, moveSpot1.Length);
59.                    
60.                     waitTime = startWaitTime;
61.                 }
62.                 else {
63.                    
64.                     waitTime -= Time.deltaTime;
65.                 }
66.             }
67.         }
68.         else
69.         {
70.             if (randonSpawn == 1)
71.             {
72.                 transform.position = Vector3.MoveTowards(transform.position, moveSpot2[randonSpot].position, speed * Time.deltaTime);
73.                 if (Vector3.Distance(transform.position, moveSpot2[randonSpot].position) < 0.2f)
74.                 {
75.                     if (waitTime <= 0)
76.                     {
77.                         randonSpot = Random.Range(0, moveSpot2.Length);
78.                         waitTime = startWaitTime;
79.                     }
80.                     else
81.                     {
82.                         waitTime -= Time.deltaTime;
83.                     }
84.                 }
85.             }
86.         }
87.     }
88. }

 

In the thread NavMesh Tutorial Resources I have linked a video that shows you how to spawn enemies at random points on a NavMesh, that's in AI Series Part 4.
In the AI Series Part 11 I went over how to set up a state machine including picking random points on a NavMesh to patrol as well as random idle movement.

Between those two I think they will help you with what you are trying to implement here.