Glad to hear you're interested in this great hobby, but if your only motive for doing it is $$$, you would be further ahead getting a 2nd job. Nothing about ginseng is \"get rich quick\". I spent 6 vacation days from work last year, and I got less than $200 for my effort. I went from place to place to place, mostly finding none, sometimes finding some babies. Most people here do it for the enjoyment/relaxation first, comradery with other diggers second, and for the money third.
If you are serious about becoming a digger, you need to know the plant from the tip of the root to the tip of the last leaf. It is a unique looking plant once you know what to look for. Study pictures online of the top, the leaf pattern, the leaf shape, the color of the leaves during different weeks of fall, and know how to tell the root direction when you're digging, since broken roots are not worth anything.
Learn where to look and what types of environment it grows, learn how to dig correctly, be a good steward of what you are digging, and what you are leaving behind, learn how to clean it, learn how to dry it, learn where to sell it. All of this is best understood by finding someone who has done it before, and asking lots of questions. But, if you don't have access to a digger, search through all the posts here in the Forums, mostly anything you can ask has been answered already.
Regarding digging on public land, in my state it is illegal. Know all the laws before you head off into the woods.
I can tell you that it grows in mostly hardwood forests, not near pines and hemlocks. It needs dark shady woods. If you plan on growing it, there is a whole new set of advice you need to follow in order to get good quality roots to grow that will be worth money in 15 years. Roots that are grown in wrong soil or too sunny conditions end up looking like a carrot, and aren't worth any money at all. The good quality roots are old, gnarly, tight growth rings from slow growing, have had to fight their way through other plant roots and rocks to survive for 20+ years. This is a lot different condition that growing it in a greenhouse.
Welcome to the forums, I hope you enjoy yourself.