I wanna paint my Sturmovik!
1 - get the template.zip for the sturmovik, from jason's post.
2- get GIMP, or any other of the Popular Graphics Manipulation programs (Adobe Photoshop CS2 is so outdated they don't mind you having it for free)
3 - open the Zip, and find the PSD file in there.
4 - open the PSD file with your Graphics program.
5 - understand that the PSD file is like a big set of transparent sheets of plastic stacked like a tower. You look at the sheets from above.