Here, look at this:
Look at it. LOOK AT IT AND LOVE IT AAAAHHHRRGGGG!!!
Anyway, there are three objects here... a player, a bullet, and the barrier to keep the player from going offscreen.
We can ignore the barrier.
Look at the bullet. Check out it's properties. It's set to Bullet Movement. Easy enough, eh?
Now look at the player. Double-click it. Select Image Points in the Picture Editor. Notice where the "fire" image point is set. Now go back to the layout.
Select the player again, and look at the Animator Bar tab. Notice that there are two angles for the player, 0 degrees and 180 degrees (right and left). If you select the 180 degrees animation and double-click the frame in the Animator Bar, you will notice that the "fire" Image Point is set up here as well... but it's on the opposite side. This is because we have to compensate for the gravitational field of Jupiter during winter. Or maybe because the player is just facing the other way.
Now look at the Event Sheet Editor. We have three simple events:
The first two orient the player when we press a directional key. This is based off the angles set up in the animator bar.
The third fires a bullet. The bullet spawns at the player's image point "fire." It automatically orients itself based on the player's angle. There is no need to specifically tell it which way to go, it already knows. It's got a doctorate in physics.
If you study this example, I'll bet you can figure out how to make your player shoot up, as well. I mean shoot in an upward direction, not take heroin. Winners never use drugs.