About cloned scripts

There is not a lot of info here, so I have made some assumptions.

• In the prefab, whatever script you have inside it, don't put the code you want to run inside the start method (anything in start or awake gets run as the object is created and enabled). Put it in a separate method, and name it appropriately (for arguments sake, lets call it DoSomething())

• Create a 'controller' class in your project.

• Use this to initiate and control the 'cloning' of your prefabs. (Resources.Load())

• As you clone each prefab, use GetComponent() to get a reference to its script.

• Store this in a Dictionary or a List (Or you could store a reference to the Gameobjects themselves.)

• Pick a random entry from the Dictionary or List, use GetComponent().DoSomething(insert any params if needed) to run the method of that specific cloned GameObject.

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and some illustrative code for a 'controller' class:

             //a list to store the scripts
             List<SomeScript> scriptList = new List<SomeScript>();
 
             //instantiate a copy of a prefab
             GameObject go = (GameObject)Instantiate(Resources.Load("Prefabs/MyPrefab"), launchedPanels.transform);
             //grab the script component from it
             var script1 = go.GetComponent<SomeScript>();
             //and chuck it in our list
             scriptList.Add(script1);
             //repeat
             GameObject go2 = (GameObject)Instantiate(Resources.Load("Prefabs/MyPrefab"), launchedPanels.transform);
             var script2 = go2.GetComponent<SomeScript>();
             scriptList.Add(script2);
             //repeat a third time
             GameObject go3 = (GameObject)Instantiate(Resources.Load("Prefabs/MyPrefab"), launchedPanels.transform);
             var script3 = go3.GetComponent<SomeScript>();
             scriptList.Add(script3);
 
             //grab the first (in your case, you could write some code to pick a random element instead), and then run the DoSomething() method on it
             scriptList.FirstOrDefault().DoSomething();

The above is very crude - there is so much more that can be said, but ill leave it at that for simplicity. It's really just a sample to get you thinking.