Yes, to expand of what Dvash said, some people will spell it Bratzlav or Breslov. I first got into it via Rebbe Nachman’s Stories, which have really good commentary by R. Aryeh Kaplan. If you want community, though, and you plan on staying in America, it’s a bit tricky. Don’t get me wrong, I have nothing but good things to say about Breslev, but there aren’t many significant, organized communities in The States. There are some in Boro Park and maybe Monsey, but it would be all Yiddish speaking I think.
In theory, the Na Nachs are just a group that hold by the “petek.” A note found by R. Odesser which says to sing the “Na Nach” chant. While there’s no inherent harm in singing a random chant, the group has grown into a kind of anarchist, Neo-Chassidic group. In other words, some of them might do some things (particularly in the naggia and tznius categories) that are outside of the limits of Chassidism and that Rebbe Nachman never would have condoned.