Well RGB wont do any good whatsoever when it comes to airbrushing. It is additive color versus subtractive which all pigments are.
The color wheel should be used as a guide, The differences in a cmyk color wheel and (The real color wheel TM) Are minor, the Munsell system is very accurate, however its a lot more than just a color wheel. There exists no perfect color wheel, And the closest you can get is in making your own with the actual pigments you use. Even then, despite my tutorial showing a straight line, color does not flow that linear. It just is not that neat and straight. It curves. I have taken to using a photocopy of one i created myself as my main color wheel. Its still not perfect. More important is to match the paint you use to the points on the wheel. There are only a couple of commercially available multiple value color wheels that im aware of. And the Value in color is where most peoples heads start to get messed up. The munsell chart still has the best layout to try and understand value within a given hue, but thats a really big book, and a lot of charts to try and hang on the wall.
Making a few tint tone and shade charts, and making your own color wheel should help start to grasp it. After a time mixing colors starts to become a lot more intuitive and you rely less and less on charts and even the color wheel. You will eventually learn to SEE the value and the saturation. And even then, when you change paint lines, there is always a learning curve again. I can freely go between golden and CI. And a little less so wicked without thinking about it. As for tubes and airbrush, all pigments are affected by the same mixing ratios, however an airbrush has its quirks,, between blue shift, its ability to alter saturation based upon thickness of layers etc.
Color is a wonderful yet deep rabbit hole you can go down as deep as you want. But the basics can take you a very very long way.