I recently got into airbrushing myself, also for warhammer. I got This to start. That airbrush worked fine, but be warned, you will be buying replacement nozzles a lot. The compressor that came in the kit works great though. If you can swing the cost, I would get something like a Badger Patriot 105, I got it shortly afterwards and am saving money by not having to buy replacement parts all the time.

I just bought one as a starting kit a few weeks ago. I bought the one with the compressor with attached air tank. So far it's worked great for me and it's eased me into airbrushing and airbrush maintenance without having to worry about spoiling it, because the airbrush itself is just 25 bucks or less. If you do buy it, before starting, make sure you apply thread seal tape on all male connectors, and also soak the little nozzle and small parts in a warm mix of dish soap and water.

Edit : here's the Amazon link. https://www.amazon.com/Master-Airbrush-Dual-Action-TC-20T-Compressor/dp/B002KSQHB6/ref=mp_s_a_1_5?ie=UTF8&qid=1549108384&sr=8-5&pi=AC_SX236_SY340_QL65&keywords=master+airbrush+with+air+compressor&dpPl=1&dpID=41nADShdRIL&ref=plSrch