private List<Enemy> enemies = new List<Enemy>();

int count = YourRandomGenerator.NextInt(10);
for (int i = 0 ; i < count ; i++) {
    enemies.Add(new Enemy());
}

enemies[0] // first enemy
enemies[1] // second enemy
// etc

Random rnd = new Random();
 int randomEnemies= rnd.Next(1, 10); //random number of enemies

List<Enemy> enemyList = new List<Enemy>();

for (int i = 0; i < randomEnemies; i++)
{
   Enemy enemy= new Enemy() { name= "bad people",damage= "15"}
   enemyList .Add(enemy);
}

for (int i = 0; i < 10; i++)
{
      Enemy enemy = enemyList[i];
}

public class Enemy
    {
        public string name{ get; set; }

        public string damage{ get; set; }
    }