Public array in the inspector

Hi, I'm following about this, but I don't understand or I don't do well for doing this. I will make a public array, for example, of materials, but when I put:

 public class humanCreation : MonoBehaviour {
 
 Material[] skinPrefabs;   // for exeple
 
  Material[] skinPrefabs = new Material[6];  // or this for exemple
 
 }

Don't appear nothing in the inspector, so I make this:

 public class humanCreation : MonoBehaviour {
 
     public Material body1;       //cuerpo
     public Material body2;
     public Material body3;
     public Material body4;
     public Material body5;
     public Material body6;
 
 void creationSkin()
     {
         Material[] skinPrefabs = new Material[6];
         skinPrefabs[0] = body1;
         skinPrefabs[1] = body2;
         skinPrefabs[2] = body3;
         skinPrefabs[3] = body4;
         skinPrefabs[4] = body5;
         skinPrefabs[5] = body6;
         body.GetComponent<Renderer>().material = skinPrefabs[Random.Range(0, skinPrefabs.Length - 1)];
 
 }

I know that I can optimize which switch but I prefer doing the public array in the inspector... If always tell me how I can do a public array I will stay very happy xD

pd: sorry for my English :(