I would start with mass and nh, since you’re living there. Almost guaranteed that Boston metro has more demand than nh as a whole. There are various firms for legal and insurance that will help you establish yourself across New England as the states are so close together and they can benefit from your business expanding as well. Might be worth it to spend a year apprenticeship with another company to learn the niche areas of the piano tuning industry over here, and maximize your potential when you start your business