How do I convert This GUI script to Unity UI?

So I have this script for character creation in my rpg but it uses the old GUI. I want to convert this script some how so that it uses the new Unity UI, however I'm not sure how please help. My script:

using UnityEngine; using System.Collections;

public class CreateNewCharacter : MonoBehaviour {

 private BasePlayer newPlayer;  
 private bool isRogueClass;  
 private bool isWarriorClass;
 private bool isThiefClass;
 private bool isSoldierClass; 
 private string playerName = "EnterName";

 // Use this for initialization
 void Start () {  
     newPlayer = new BasePlayer();  

 }

 // Update is called once per frame
 void Update () {  

 }

 void OnGUI(){  
     playerName = GUILayout.TextArea (playerName, 15);  
     isRogueClass = GUILayout.Toggle (isRogueClass, "Rogue");
     isWarriorClass = GUILayout.Toggle (isWarriorClass, "Warrior"); 
     isThiefClass = GUILayout.Toggle (isThiefClass, "Thief"); 
     isSoldierClass = GUILayout.Toggle (isSoldierClass, "Soldier");   
     if (GUILayout.Button ("Create")) {  
         if (isRogueClass) {  
             newPlayer.PlayerClass = new BaseRogueClass ();   
         } else if (isWarriorClass) {
             newPlayer.PlayerClass = new BaseWarriorClass ();  
         } else if (isThiefClass) {
             newPlayer.PlayerClass = new BaseThiefClass (); 
         } else if (isSoldierClass) { 
             newPlayer.PlayerClass = new BaseKnightClass (); 
         }    
         newPlayer.PlayerLevel = 1;   
         newPlayer.Constitution = newPlayer.PlayerClass.Constitution;  
         newPlayer.Intellect = newPlayer.PlayerClass.Intellect; 
         newPlayer.Strenht = newPlayer.PlayerClass.Strenght; 
         newPlayer.Perception = newPlayer.PlayerClass.Perception; 
         newPlayer.Charisma = newPlayer.PlayerClass.Charisma; 
         newPlayer.Dexterity = newPlayer.PlayerClass.Dexterity; 
         newPlayer.Luck = newPlayer.PlayerClass.Luck; 
         newPlayer.Fortitude = newPlayer.PlayerClass.Fortitude; 
         newPlayer.PlayerName = playerName;  

         Debug.Log ("Player Name " + newPlayer.PlayerName); 
         Debug.Log ("PLayer Class " + newPlayer.PlayerClass.CharacterClassName); 
         Debug.Log ("Class Description " + newPlayer.PlayerClass.CharacterClassDescription); 
         Debug.Log ("Player Level " + newPlayer.PlayerLevel); 
         Debug.Log ("Constitution " + newPlayer.Constitution);         
         Debug.Log ("Intellect " + newPlayer.Intellect);  
         Debug.Log ("Strength " + newPlayer.Strenht); 
         Debug.Log ("Perception " + newPlayer.Perception); 
         Debug.Log ("Charisma " + newPlayer.Charisma); 
         Debug.Log ("Dexterity " + newPlayer.Dexterity); 
         Debug.Log ("Luck " + newPlayer.Luck); 
         Debug.Log ("Fortitude " + newPlayer.Fortitude); 

     }
 }

}