First, welcome to the forum. I am with tigerman. For airbrushing, acrylic paint is the best because of easy clean up, and most important, most acrylic paints are non-toxic. But STILL you need good ventilation and repiratory protection, also young children or babies or pregnant should not be around. One weakness of airbrushinng acrylic paint is that after the paint is dried, it's could be chiped off or scratch off more easily compare to enamel paint(which is stronger when dried), you may need to airbrush a thicker layer. To me Tamiya acrylic paints are the best. They are easy to thin, last longer and have excellent adhesion. Mr Colour(Gunze Sangyo) and Model Master and Polly Scale acrylic paints have more varieties to choose and many are specfic for specfic vehicles( e.g. olive drab for modren US tank, WWII tanks, UAAF planes etc). I find them ok but easier to dry, therefore they may clog paint nozzel of your airbrush(to solve this problem: rub the nozzel tip with a cotton swab dipped with thinner).
Due to the toxicity of enamel paint, I mostly try to avoid airbrushing enamel except in very rare occasion. If I have to airbrush enamel paint, I would do it in outdoors(in the balcony or back yard) whenever possible. Again good ventilation and respiratory protection are must.
For hand brushing, I would recommend enamel paints. Because of the surface tensionc enamel oily texture can easily spread through out the surface. Enamel paint IS TOXIC, so good ventilation and respiratory protection are must. IMHO, Humbrol makes the best enamel paint. They have good texture and dry slowlly therefore less likely to leave brush track. Model Master and Testors arre also very good.