If you have experience with using a spray gun, why not use automotive paints for your models?
I use House of Kolor primarily and thin it 1:1 (most manufacturers suggest mixing it 2:1 but I find that 1:1 works a little better, for me, for airbrushing. You can purchase HOK paints, in small, ready to spray amounts, from www.coastairbrush.com
I use Tamiya paints for the remainder of the small parts and I usually reduce it with a little bit of either Tamiya thinner or 91% alcohol. I spray with a little more pressure than a lot of people do, but I have found that it works for me...I spray around 30-35 psi.
I have not used a Talon yet, I use Iwatas, but I hear that the Talon is a nice airbrush. If you haven't used an airbrush before, or you haven't used one in a while, I would suggest that you "practice" the motion of using it (press down for air and back for paint) while watching tv, stuck in traffic, etc. This will help you get used to how that operation works and gives your fingers a chance to develop muscle memory. Then, once you get the hang of the operation, do a little practice on some inexpensive paper (paper towels, butcher paper, junk mail, etc). I, along with several other folks, like to use spoons to see how the color will look, or to check color combinations.
Above all, take your time with the learning curve and have fun. Don't let it stress you out or you might end up like a lot of people...with an expensive paper weight on your workbench.