Hello, welcome to my first Photoshop tutorial. I am using CS5, but CS4 will be almost the same. This tutorial will be basic, but it will have a cool effect when using the pentool (Y).

Ok, to start you need to open a new file with what ever dimensions you need.
[ Register or Signin to view external links. ]
After, you will need to select the Brush tool, and put the hardness to 100% and put the size to around 4px.
[ Register or Signin to view external links. ]
Then, you will need to use the paint bucket tool to make the background black.
After, you will create a new layer (ctrl+shift+n)
[ Register or Signin to view external links. ]
Then, select the pen tool and use it to do what you want (e.g draw round a gun)
After you have done that, you will set the colour to white, right click the thing you have pentool'd and click stroke path.
[ Register or Signin to view external links. ]
Then, use these settings:
[ Register or Signin to view external links. ]
It should turn out something like this:
[ Register or Signin to view external links. ]
You will then need to right click the layer with the pentool on, and click blending options.
[ Register or Signin to view external links. ]
Then use these settings (feel free to tweek it to what you think is best):
[ Register or Signin to view external links. ]
You should end up with something like this:
[ Register or Signin to view external links. ]

Thanks for reading, and post if it worked, or if you have any questions.

- Liam