var bullit = GameObject.Instantiate(bullitPrefab, GameObject.Find("Spawn Point").transform.position, Quaternion identity);
2- The third line should be declared outside any function, and start with @script:
@script RequireComponent(CharacterController);
But you can delete this line if you want - it’s there just to ensure that this script will only be attached to a CharacterController owner, and you have a lot of other problems to worry about.
3- When pressing the “Jump” button, a bullet will be instantiated at the “Spawn Point” object position, and at most will fall to the ground (if it has a rigidbody and Use Gravity set). You will need additional code to accelerate the bullet, and also an empty object called “Spawn Point” childed to the player. In a brief, you’d better watch the Tornado Twins tutorial and do it right (that’s the source of this “bullit” piece of code).