Lookat targeted enemy and orbit - unity3d

Question

Previously I had a script that I could look at a player but only when I had the Tab buttoned pressed down but could not cycle through enemies or anything. Looking all day for answers I came by this and decided it would be great I can now find things tagged enemies and cycle though them but I have not been able to figure out a way to lookat the enemy and stay looking at them and be able to move around them in a circle.
public class debug : MonoBehaviour
{
public List<Transform> targets;
public Transform selectedTarget;
public string targetTag = "Enemy";
private Transform myTransform;
//Use this for initialization
void Start()
{
targets = new List<Transform>();
selectedTarget = null;
myTransform = transform;
AddAllEnemies();
}
public void AddAllEnemies()
{
GameObject[] go = GameObject.FindGameObjectsWithTag(targetTag);
foreach (GameObject enemy in go)
{
AddTarget(enemy.transform);
}
}
public void AddTarget(Transform enemy)
{
targets.Add(enemy);
}
/*private void SortTargetsByDistance()
{
targets.Sort(delegate (Transform t1, Transform t2) {
return (Vector3.Distance(t1.position, myTransform.position).CompareTo)
(Vector3.Distance(t2.position, myTransform.position));
});
} */
private void SortTargetsByDistance()
{
targets.RemoveAll(target => target == null);
targets.Sort(delegate (Transform t1, Transform t2) {
return (Vector3.Distance(t1.position, myTransform.position).CompareTo)
(Vector3.Distance(t2.position, myTransform.position));
});
}
private void TargetEnemy()
{
if (selectedTarget == null)
{
SortTargetsByDistance();
selectedTarget = targets[0];
}
else
{
int index = targets.IndexOf(selectedTarget);
if (index < targets.Count - 1)
{
index++;
}
else
{
index = 0;
}
selectedTarget = targets[index];
}
}
//Update is called once per frame
void Update()
{
if (Input.GetKeyDown(KeyCode.Tab))
{
TargetEnemy();
}
}
}
I am trying to use transform.LookAt(TargetEnemy); in void update but I get an error saying cannot convert from method group to transform. Im really stuck on this now any help is appreciated.
Edit: I am a big dummy I used transform.LookAt(selectedTarget); instead and the character for a split second will turn and lookat the enemy. Now i need to keep the player looking at the target and move around them.

Answer 1

Transform.LookAt
You need to pass it a Transform, not void.
TargetEnemy();
transform.LookAt(selectedTarget);
Alternatively, you can make TargetEnemy() return a Transform.:
private Transform TargetEnemy()
{
/* stuff */
return selectedTarget;
}
transform.LookAt(TargetEnemy());

Answer 2

Hello thanks to everyone that looked and thank #SonicBlue22 for your answer I figured it out after a couple more hours.
void Update()
{
if (Input.GetKeyUp(KeyCode.Tab))
{
TargetEnemy();
transform.LookAt(selectedTarget);
}
if (selectedTarget != null)
{
transform.LookAt(selectedTarget);
}
if (Input.GetKeyUp(KeyCode.Q))
{
selectedTarget = null;
return;
}
}
}