SpawnManager

Question 1

public GameObject obstaclePrefabs;

private Vector3 spawnPos = new Vector3 (25,0,0);

Answer 1

void Start()
{
Instantiate(obstaclePrefabs, spawnPos, obstaclePrefabs.transform.rotation);
}

Question 2

private float startDelay = 2;

private float repeateRate = 1;

Answer 2

void Start(){ InvokeRepeating ("SpawnObstacle",startDelay, repeateRate);
}
void SpawnObstacle(){
Instantiate(obstaclePrefabs, spawnPos, obstaclePrefabs.transform.rotation);
}

Question 3

public GameObject enemyPrefab;

Answer 3

Instantiate(enemyPrefab, randomPos, enemyPrefab.gameObject.transform.rotation);