I'm still learning.
One mistake I made at first was to buy a very cheap "knockoff" airbrush on Ebay - it looked like the pro airbrushes for a fraction of the price.
Needless to say, I got what I paid for.
I'm sure you will get varying recommendations on airbrushes depending who you talk to.
One thing I did when I decided to invest in a decent airbrush was to do some homework.
I read product reviews on various websites and watched YouTube demonstration videos.
I now own two great quality airbrushes - both Paasche, one a gravity-feed and the other a syphon feed.
while there are pros and cons to both styles, preference is a big factor and I was just curious to experience the difference first hand.
Truth be told, I prefer my syphon feed because the container is larger to hold more paint and for some readon, in my own personal experience, I've had less clogging issues with it.
There are a number of "power seller" dealers on Ebay that offer legit pro airbrushes at fantastic prices. Brands like Paasche, Badger and Aztec can be obtained for considerably lower cost than buying direct or buying from an art supply store.
Many of these Sellers will offer bundle auctions that include a compressor.
You will need a reliable compressor anyway, so it might be advisable to get a bundle deal.
As with the airbrush, it may help to educate yourself on product quality before buying a compressor.
I have two compressors (one at the workshop the other at home) and for my home hobby area (which I call "site B") I didn't have alot of money to spend on a compressor, so I purches a small one at Walmart that ran under $60.
Works just fine but is EXTREMELY loud when compressing and since the tank size is small, it blares on frequently during extensive spray sessions.
Sure, the loud noise is horrible on my ears BUT it was the sacrifice made to pay such a small amount of money.
You will find that alot of the pro brand compressors can run several hundred dollars.
I personally don't think you have to drop $300 on a Paasche or Badger compressor to enjoy your airbrush.
Go to Lowes, Home Depot or Walmart and buy a less expensive but equally reliable model for less - especially if you are just starting out.
If and when you get better at learning to use your airbrush, you may find yourself wanting to upgrade your equipment - a very natural step and completely aporopriate and I always encourage hobbyists to learn by upgrading.
It took me several projects to really start to get the hang of airbrushing.
I struggled most with thinning paint and getting that perfect viscosity for painting.
I've had so much practice thinning paint for airbrush (be it enamel, lacquer or acrylic) that I can pretty much nail it every time.
I've rambled on here with loads of info, so I hope you are still with me!
Though I learned some of my techniques by watching tutorial videos, most of what I know came from trial and error.
All I can suggest to you now would be to pick up a decent starter airbrush and really practice getting the hang of it. When you've built up some confidence and skill, upgrade to better equipment.
Good luck and share your success here on the RPF!