what is your visa status in US?
From my understanding, you should hold H visa if you want to apply for LC, actually, your employer apply the LC for you. Your employer must prove that there is shortage or unable to recruit american employee for a certain amount of time. Your employer is the key player of the LC application. I think as far as your qualification, you should hold H visa and medical license.
LC is different from the path of NIW. NIW could be self petition based on working in HPSA.