Assign video in inspector via script

Hi,

I've been trying to figure out how to assign a variable in inspector via script, from what I've found it seems you have to first search for the game object and then use GetComponent. However, all the examples I have seen are editing images and using spriterenderer mostly, not actually assigning one thats attached to a script.

I have a canvas that has a child which is a RawImage (just called RawImage as well), with a script attached to the RawImage that plays a video. The video plays fine, however if I assign it via the inspector that is the only video that is able to be played, I want the video to be played based on a variable that contains a video file name (meaning it has to be done via script and can't be manually assigned as it will constantly change).

My script is:

  using UnityEngine;
  using UnityEngine.UI;
  using System.Collections;
  
  [RequireComponent (typeof(AudioSource))]
  
  public class PlayVideo : MonoBehaviour {
      
      public MovieTexture video;
      private AudioSource audio;
      public string videoName;
  
      // Use this for initialization
      void Start () {
      // videoName = Character_Mode.name // this gets the string from another script that contains the video file name which is what I want to assign 
  
          GetComponent<RawImage> ().texture = video as MovieTexture;
          audio = GetComponent<AudioSource> ();
          audio.clip = video.audioClip;
          video.Play ();
          audio.Play ();
      }
      
      // Update is called once per frame
      void Update () {
      
          if (Input.GetKeyDown (KeyCode.Space) && video.isPlaying) {
              video.Pause ();
          } else if (Input.GetKeyDown (KeyCode.Space) && !video.isPlaying)
              video.Play ();
          }
  
  }

For clarification here's how everything looks

tldr; I want to use a video file name stored in a string, and assign that to the video in inspector, but via script.

Thanks in advance, I'm new to Unity and C# so sorry if it as simple as finding the object and using GetComponent, I just really can't work it out and can't find any similar examples! :(