How to pick a good WOK?
An important consideration is whether you have a gas stove or must make do with @#$%?&* electric burners. I have the latter, and bought a little Joyce Chen Peking Pan, which is a flat-bottomed wok (the carbon-steel one, under $20 Canadian here so certainly less in the US, if that is where you are). I had a cheap one from Chinatown before, which was fine when I had a gas stove - wound up giving it to a charity shop.
That is a small wok - for one or two persons. The one I use every day, though I do have a bigger one.