Considering selling in us?

This isn’t an application to sell or anything just a general question. I am considering selling in the us. I have a great supplier(I loves him) and was thinking it may be a good way to get bags to others local as well (there is a high luxury interest around me). I see people closer in area to me do it on fb market place and I’ve also sold a few bags there myself, but I’m curious of a more secure way to do it considering what it actually is? Like a pop up shop or possible poshmark? Any and all advice and thoughts welcome. I am not selling right now just researching before considering.