You're kidding! See: Home»Discussion Forums»Tools, Techniques, and Reference Materials»Painting and airbrushing Techniques, airbrushing advice, compressors, and spray booths.
But as to some advice: Get yourself a book on airbrushing, ANY book on airbrushing, it doesn’t matter whose. The basics are still the basics. (Kalmbach won’t appreciate my counsel, but you can save yourself a little money by visiting your public library.) Read it. It won’t make you an expert, but it will answer most newbie questions.
Also there are some paint effects that are next to impossible to accomplish without an airbrush. Next to impossible, not impossible. Otherwise, a brush is just fine. (Some real-world armor, viz. WWII T-34s, were painted by soldiers using brushes, not a spray gun, and looked like it.) What are you planning?
Occasional factual, grammatical, or spelling variations are inherent to this thesis and should not be considered as defects, as they enhance the individuality and character of this document.