Modular helmet recomendation
Bom Dia! Don't worry about your English. There are plenty of Brasileiros in Rhode Island and Boston, mostly from Minas Gerais. I spent 8 years in Boston and there are no true "discount" stores there for motorcycle gear but plenty of dealers. A few recommendations in the Boston area: Greater Boston Motorsports (Arlington, MA) and Riverside Motorsports (Somerville, MA). I recommend going to one of these OR buying online through Revzilla or Motorcycle Superstores once you know your size and what you want.
There are some good Brazilian restaurants in Cambridge and Somerville Massachusetts (churrascaria). Check out the Midwest Grill in Inman square, Cambridge. It is close to Riverside Motorsports.