Problem with adding items to a list

I'm trying to make a database of enemies for my turn based fighting game. So far I tried two things and neither worked, but I feel like this way is the better approach. If you know another method to make a database (preferably without an external source) please include it in your answer. This is my code for the database:

  using System.Collections;
     using System.Collections.Generic;
     using UnityEngine;
     
     public class EnemyDatabase : MonoBehaviour {
         public List<Enemy> enemyList = new List<Enemy>();
         // Use this for initialization
         void Start () {
             //ENEMY CREATION
             Enemy e0 = new Enemy ();
             e0.enemyLevel = 1;
     
             e0.maxHealthPoints = 200;
             e0.maxManaPoints = 100;
     
             e0.minAtk = 10;
             e0.maxAtk = 20;
             e0.minMAtk = 0;
             e0.maxMAtk = 0;
     
             e0.phPenetration = 0;
             e0.magPenetration = 0;
     
     
             e0.armor = 0;
             e0.magRes = 0;
     
             e0.baseTime = 1;
     
             e0.critChance = 0;
     
             e0.critMult = 0;
     
             e0.blockChance = 0;
     
             e0.blockAmount = 0;
     
             e0.evadeChance = 0;
             e0.hitRate = 0;
     
     
             e0.lifeSteal = 0;
             e0.manaSteal = 0;
     
             e0.healthRegen = 0;
             e0.manaRegen = 0;
     
             e0.soulValue = 5;
             e0.goldValue = 0;
             e0.itemOdds = 0;
             e0.itemRarity = 0;
     
             enemyList.Add (e0);
             }
         
         // Update is called once per frame
         void Update () {
             
         }
     }

And this is where I use it:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using System.Linq;
 
 public class CurrentEnemy : MonoBehaviour
 {
     public EnemyDatabase databaseEnemy;
 
     public int enemyLevel;
 
     public int soulValue; //determines soul points you get from killing it
     public int goldValue; //determines gold you get from killing it
     public int itemOdds; //determines the odds of getting an item
     public int itemRarity; //determines the rarity of dropped item
 
     public float maxHealthPoints; 
     public float healthPoints;
     public int maxManaPoints; 
     public int manaPoints;
 
     public int minAtk, maxAtk;
     public int minMAtk, maxMAtk;
     public int phPenetration;
     //reduces oponents armor
     public int magPenetration;
     //reduces oponents magic resist
 
     public int armor, magRes;
 
     public int aSpeed; //items
 
     public int aSpeedMult; //skills, passives
     public float baseTime; //weapon
     //base interval of attacks
     public float atkTimer;
     //atkTimer=base*aCoef
 
     //>100 => %
     public int critChance;
     //float critChance 0-100
     public int critMult;
 
     public int blockChance;
     //Same as crit
     public int blockAmount; //shield, weapon
     //0-100
     public int evadeChance;
     public int hitRate;
     //reduces oponents evasion
 
     public int lifeSteal, manaSteal; //skills, passives, items
 
     public int healthRegen;
     public int manaRegen;
 
 
     public void LoadEnemy(){
         int index=0;
         Debug.Log (databaseEnemy.enemyList.Count ());
         for (int i = 0; i < databaseEnemy.enemyList.Count (); i++) {
             if (databaseEnemy.enemyList [i].enemyLevel == enemyLevel)
                 index = i;
         }
         Debug.Log (index);
         maxHealthPoints = databaseEnemy.enemyList [index].maxHealthPoints;
         maxManaPoints = databaseEnemy.enemyList [index].maxManaPoints;
 
         minAtk = databaseEnemy.enemyList [index].minAtk;
         maxAtk = databaseEnemy.enemyList [index].maxAtk;
         minMAtk = databaseEnemy.enemyList [index].minMAtk;
         maxMAtk = databaseEnemy.enemyList [index].maxMAtk;
 
         phPenetration = databaseEnemy.enemyList [index].phPenetration;
         magPenetration = databaseEnemy.enemyList [index].magPenetration;
 
         armor = databaseEnemy.enemyList [index].armor;
         magRes = databaseEnemy.enemyList [index].magRes;
 
         baseTime = databaseEnemy.enemyList [index].baseTime;
 
         critChance = databaseEnemy.enemyList [index].critChance;
         critMult = databaseEnemy.enemyList [index].critMult;
 
         blockChance = databaseEnemy.enemyList [index].blockChance;
         blockAmount = databaseEnemy.enemyList [index].blockAmount;
 
         evadeChance = databaseEnemy.enemyList [index].evadeChance;
         hitRate = databaseEnemy.enemyList [index].hitRate;
 
         lifeSteal = databaseEnemy.enemyList [index].lifeSteal;
         manaSteal = databaseEnemy.enemyList [index].manaSteal;
 
         healthRegen = databaseEnemy.enemyList [index].healthRegen;
         manaRegen = databaseEnemy.enemyList [index].manaRegen;
 
         soulValue = databaseEnemy.enemyList [index].soulValue;
         goldValue = databaseEnemy.enemyList [index].goldValue;
         itemOdds = databaseEnemy.enemyList [index].itemOdds;
         itemRarity = databaseEnemy.enemyList [index].itemRarity;
     }
 
 
     void Start ()
     {
         enemyLevel = 1;
         LoadEnemy ();
     }
 
 
 
     // Update is called once per frame
     void Update ()
     {
         if (healthPoints < 0)
             healthPoints = 0;
     }
 }

I'm getting the following console error: I think my List is empty. I followed a guide where the person initialized the List like this: public List enemyList = new List(); And the enemies : Enemy e0 = new Enemy (); I don't know if this is right, but it worked for him. Again, if you know a better approach, please share. Thank you very much!