This is a very simple tutorial pretty much all basic
STEP 1:
Open your background. I will be using this one for mine:

Now open a bullet render, or make one, it doesnt matter. Have something looking like this:

STEP 2 (optional):
Now some people like the wavey matrix effect to show slow motion on a bullet.
You can get a wavey render or make the waves yourself. I'm going to make mine using the pen tool, but in the end it should look like this.

STEP 3:
Now move the document into ImageReady.
Lock the layer with the bullet on it with layer that the waves are on
and duplicate the first frame.
On the second frame move the bullet (which will move the waves as well since they are locked) to the end point you want them to move to.
Now tween it by clicking the Tween button on the Animation Palette. The more frames you add, the slower it goes.
It should now look like this:

Usually these effects do not look nice by themselves; you need to use them with a render, or you can make the waves disapear and appear at different rates. You can do this by putting them on different layers and make them appear and disappear instead of moving like they did.
You would get an effect like this:

There are the basic concepts which you can use in different ways to give you great effects.