How to do things before Awake? Objects constructors

Usually then we instantiate objects in Unity the first thing to happed is the

For this example we have a Cube and a GameManager.

For the Cube we will create a CubeScript with the values for speed and rotation, a constructor function and we will use the speed and rotation too (but it's not relevant for right now).

public class CubeScript : MonoBehaviour
{
    float speedX = 0;
    float rotationY = 0;

    public void SetUp(float speedX, float rotationY)
    {
        this.speedX = speedX;
        this.rotationY = rotationY;
    }

    void Start()
    {
        this.GetComponent<Rigidbody>().velocity = new Vector3(speedX,0,0);
    }

    void Update()
    {
        this.transform.Rotate(new Vector3(0, rotationY, 0));
    }
}

For the GameManager we will create a script called InstantiateManager.

in this script we will call the cube gameobject, use the setup function and then instantiate it

public class InstantiateManager : MonoBehaviour
{
    [SerializeField]
    GameObject cube;

    void Start()
    {
        cube.GetComponent<CubeScript>().SetUp(1, 1);
        Instantiate(cube.gameObject);
    }
}

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Extra:

In the InstantiateManager, if you use the SetUp function right after you instantiate the object, and not before, the function will happened after Awake & OnEnabled but will happened before Start.