In order to settle the New England region, you need the game pieces and cards from the Catan base game.
You also need additional markers for victory point tokens; you can use Catan chits from the Seafarers expansion, coins, or whatever else is handy. The standard Catan base game rules apply to this scenario, with certain exceptions.
New England is a region in the northeastern corner of the United States consisting of the six states of Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, and Connecticut. New England is bordered by the Atlantic Ocean, Canada (the Canadian Maritimes and Quebec) and the state of New York. The earliest known inhabitants of the region were a variety of tribes who spoke various dialects of the Eastern Algonquian languages. These included the Abenaki, Penobscot, Pequot, Mohegans, Pocumtuck, and Wampanoag. The Connecticut River Valley, which includes parts of Vermont, New Hampshire, Massachusetts and Connecticut, linked these different indigenous communities culturally, linguistically, and politically.