I have written a ton on spray guns,, I recomend somthing like the FInish line series, detail or touch up gun, an airbrush with dope is ONLY good for small areas, you wont be painting more than a 1/2a with it for overall use. And not just because its painfuilly slow, but it wont let you put enough material to get it to flow.
you can use a HF 10 gun if you want, but unless you know what you are doing, you wont know if the problems are you or the gun, ,I totally recomend against it except for maybe primer,,
You can do what you want, but thats my recomendation.
Personally I spray with an Iwata airbrush ( 400$) only for shading and detail, an Iwata cup HVLP gun detail 4oz cup ( again 400 ) I use this for color and intercoat clears. and for Urethane clears I use a Sata Minijet again 400$
Now you do not have to spend that kind fo money , the finish line detail gun is a very good gun for the money , around 100$. It is HYPER critical to keep clean, but as long as it is clean it sprays wonderfully and you can get parts.
for a compressor, they only make pressurized air for the bgun to spray, buy what you can afford, remember the smaller the compressor and more important the tank, the faster it wear out. for modeling, a cheaper compressor is fine as long as it doesnt start puking oil past the piston into your airstream. drain it religiously before spraying, if you can let the tank sit for a bit to cool before you spray so you dont push condensed air through the hose. Use a larger size hose ESPECIALLY with HVLP guns, its HIGH VOLUME, so you need a good crossection on the airhose, also remember the longer the hose is the greater the friction loss and thereby pressure drop there is before the gun. setting the regulator to 40 PSI at the compressor and then pushing it through a 25 foot hose especialy a smaller hose, will net much less than 40 at th egun. ALso , your hose laying ont he cold ground will condense water out of the compressed air and give you fits.