That's okay. How about this:
Say your sprite starts facing to the right:
When you press left, your sprite flips 180 to face left. When you press right, your sprite flips 180 to face right again.
When a bullet object gets spawned from your sprite (your sprite will do "spawn another object"), it will automatically be facing the same direction as your sprite.
Don't worry about the mouse controls in the video, just focus on how he spawns the bullet. You can use the same thing in your game when you press the spacebar.