Welcome Aboard!
The airbrush thing isn't hard, it just takes a little getting use to. I was a master with a rattle can so long ago a fellow modeler encouraged me to take the step to airbrushing. He said if you can spray a rattle can well, you can airbrush even better. True.
Modelers tend to be in a hurry once they acquire an airbrush, wanting to try it out on a model. True. What I recommend is just practicing on paper first with cheap acrylic paint. Using a marker or pencil draw some lines, squares, tiangles and outlined letters on a piece of paper (hung on a wall or other vertical surface). Load up the brush and practice following lines, filling in the shapes and letters. Experiment with distances from the surface, air pressures and tips if yours has the capability. Even pick up a coloring book and do the coloring with your airbrush. In short course you'll be comfortable with it, enough to start on a model. The airbrush should be an extension of your hand. Practice make perminant. Give it a whirl.