How to make a selection list using either GUI system?

How would one go about to make a list of selectable/clickable/interactiable items (pictures, words, anything) using any GUI system (either the legacy system, the new UI system, or through scripting)? I just need to be pointed in the right direction on this problem.

Basically what I am aiming for is a general list that can be scrolled vertically showing a dynamic amount of items that can be interacted by clicking on them. (I was thinking of making buttons scroll within a window or scroll field, but I don't know how well that would go). How would the menu part be made to show this kind of list?

I have a starting point, but have no direction on what to do for making this menu...

 using UnityEngine;
 using System.Collections;
 
 [ExecuteInEditMode]
 public class GalleryMenuScript : MonoBehaviour
 {
     //Variables
     public Vector2 scrollposition;
     public string innerText = "Test";
     public Vector2 pos = new Vector2(40,60);
     public Vector2 size = new Vector2(60,20);
     
     //Aspect ratio variables
     public int width = 800;
     public int height = 600;
 
     void OnGUI()
     {
         float x = size.x * Screen.width / width;
         float y = size.y * Screen.height / height;
         
         //Start scrollview
         scrollposition = GUI.BeginScrollView(new Rect(pos.x, pos.y, x, y), scrollposition, new Rect(pos.x, pos.y, x, y));
         
         //Put something inside the ScrollView
         innerText = GUI.TextArea (new Rect (pos.x, pos.y, x, y), innerText);
         
         //End the ScrollView
         GUI.EndScrollView();
     }
 }