Painting?

Hi, zxcv, & welcome to the forum ! The pictures that you saw on the box were probably painted with an airbrush. This gives the most "professional" look. It is an investment, but it pays off in the long run (it doesn't take long to spend more money on kits than a good airbrush & compressor). If this method is not practical for you now, you may want to try spray paints. They don't offer the control that you get with an airbrush, but you can get a even, brushstroke free finish. If you are currently painting with a brush, and your problem is brush strokes, try thinning the paint. Put it on with a soft, wide brush, and minimize your strokes in the same place to two. When you brush in one place, the paint can start to "set up" (onset of drying). This is what causes the brush strokes.
Whatever you, don't give up. It takes time & experience to master the techniques of painting. It is ALWAYS a good idea to try new techniques out on a junk model, or on spare parts, until you get the hang of it. There are probably centuries of modelling experience on this forum. Feel free to ask - chances are someone will have the answer that will work for you.
GOOD LUCK & ENJOY YOUR TIME AT THIS WONDERFUL FORUM !

For scale modeling an airbrush is really the way to go like Pixilater mentioned. If you want to get started airbrushing an inexspensive set up for scale auto's I would recommend would include:
1.Airbrush: Paasche-H#1 tip with air-hose....under $40.00
2.Compressed air source: C02 tank ....$120.00 (Look under carbon dioxide dealers in your phone book)
3. Spray booth: you can spray outside or purchase a good quality one from Testors, Badger, Paasche, NorthCoast Hobbies or make your own!
For more detailed information check back issues of FSM reference airbrushing and equipment.
Others on this Forum will offer excellent alternate choices in airbrushes and equipment, so compare, do some research and shop around. Good luck!