In order to settle the region of Indiana & Ohio, you need the game pieces and cards from The Settlers of Catan Base Game.
You will also need (separate / different) markers for gold pieces and victory points (VPs): you can use Catan chips from the Seafarers expansion, or alternatively coins. The standard Catan game rules apply to this scenario, with a few exceptions.
Indiana & Ohio
Indiana and Ohio lie north of the Ohio River and south of the Great Lakes. Both were carved out of the old “Northwest Territory“ in the early 19th century.