How can I make a prefab object from a list to move?,How can I make an object from a list to move by itself?

So, I have a list of prefab objects and i randomly instantiate them at an fixed y axis position and i need them to move till -70. The problem is that I don’t know which one will be spawned.
Tried this:

Enemies[Random.Range(0, 8)].transform.Translate(Vector3.forward * Time.deltaTime * -5f, Space.Self);

but dosen’t work…
This is my script so far:

public class Enemy : MonoBehaviour
{
    public float spawnRate = 1f;

    private float nextTimeToSpawn = 0f;

    public List<GameObject> Enemies;




    // Update is called once per frame
    void Update()
    {
        Enemies[Random.Range(0f, 8f)].transform.localScale = new Vector3(Random.Range(50f, 100f), Random.Range(50f, 100f), Random.Range(50f, 100f));
        Vector3 position = new Vector3(Random.Range(-8f, 8f), -20f, Random.Range(-4f, 5f));
        Enemies[Random.Range(0f, 8f)].transform.Translate(Vector3.forward * Time.deltaTime * -5f, Space.Self);
        if (Time.time >= nextTimeToSpawn)
        {
            Instantiate(Enemies[Random.Range(0f, 8f)], position, Quaternion.identity);
            nextTimeToSpawn = Time.time + 1f / spawnRate;
        }
        
    }
}

,So, I have a list of objects, they are instantiated randomly at a fixed y axis position, and i want them to move on y axis by them-self.
I tried this:
Enemies[Random.Range(0, 8)].transform.Translate(Vector3.forward * Time.deltaTime * -5, Space.Self);
Enemies is the list of prefab objects and because i don’t really know which one is going to be instantiated I used Random.range but they are not moving.

Put the movement script on the object you instantiate. Unless there is a good reason not to, all game objects should be controlled by scripts on themselves

Enemies is a list of prefabs, not a list of instantiated objects, you need to store the instance of the object and move that instance something like this

GameObject instanceClone;

 instanceClone = Instantiate(Enemies[Random.Range(0f, 8f)], position, Quaternion.identity);

and move the instanceClone .