Stupid question about roulette and playing it in a casino?

so ive been to Atlanitc city a lot n been there with my frineds playin roulette but ive never played it there. only online n i have a way to win money so i wanna do it for real. so like, when i go there, where/how do i get chips? i know how to cash them in. n can i just quit whenever i want?