I want to buy an airbrush kit , but don't have any idea what to look for . I'm not a professional cake decorator .
This one looks at pretty good price http://cgi.ebay.com/Super-Deluxe-CAKE-DECORATING-AIRBRUSH-KIT-w-Compressor_W0QQitemZ220358089022QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item220358089022&_trksid=p3286.c0.m14&_trkparms=72%3A1205%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50
Can you recommend me one?
The most commonly recommended one is this one:
I'd suggest doing a forum search. You'll find lots of helpful hints that people have given as this topic comes up a lot.
You also should invest in an airbrush lesson book. I have this one:
It teaches all of the shading tricks along with how to do fine details. I think it's on amazon for around $17 now. It has lessons for beginner through advanced.