From a non-expert airbrush user, I ended up purchasing a Iwata Eclipse HP CS last year but never got around to using it yet (its been over a year). I was a bit gun-shy as I had absolutely zero experience with it and simply bought that model on research, price and youtube vids and recommendations. Feeling a bit overwhelmed, not willing to bust up or break my $150 expenditure, I ended up purchasing a Beater airbrush to get my feet wet with priming and simple single coat jobs.
This was primarily influenced by Barbatos Rex's review and the price of the kit ($40). Sidenote, there was an issue with one of the initial runs of the kits that was corrected by the time I ordered mine I was willing to cut my teeth on a $40 kit versus my $150 kit.
Combined with an inexpensive AS-186 type compressor (with tank) I've built up enough confidence to go way beyond priming.
Even if I were just priming with this setup, the control over priming with the airbrush versus rattle-can is simply night and day. If I were doing a couple Warhammer armies, I would definitely look towards this kind of setup, versus the $18 cans of Citadel primer.
If you have good luck with the inexpensive cans of primer, then the airbrush route, for priming, is a tougher sell.
How much are you looking to spend?
The most important thing is to get a decent compressor. The AS 186 https://www.amazon.com/Timbertech-Airbrush-Compressor-Professional-Automatic/dp/B07VT3RV47 is pretty much the standard from the research I did when I first started.
After that you need a hose. The one I got was this. It's got a 1/8 fitting which connects to the compressor. Then you just need to make sure you get an airbrush with a 1/8 fitting as well.
https://www.amazon.com/gp/product/B002FDX36I/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Then in terms of airbrushes there's a whooooole slew of different ranges from the very cheap to very expensive. There's nothing wrong with starting out with a cheaper airbrush at first for priming, base coating, and varnishing. Any of the cheaper airbrushes on Amazon would work for that. But if you want something more fitting for someone who actually wants to get into airbrushing for real, the Iwata Eclipse HP is usually the one I see people recommend.
Though I went with a 90 dollar Badger Patriot 105 myself, which I like. It just required an extra adapter in order to use it with that hose. (Badger has its own stupid proprietary thread size).
Finally you need Airbrush Cleaner and Flow Improver/Thinner. A little cleaning pot also is nice to have.