-Register your new business name.
You may choose to file your own taxes, or decide to hire an accountant. More information about taxes here: http://www.mass.gov/dor/businesses/help-and-resources/starting-and-registering-a-business/ and http://www.irs.gov/Businesses/Small-Businesses-&-Self-Employed/Starting-a-Business .
You might want liability insurance depending on what type of services you plan to offer.
You may need a city license to operate your business in a particular locale, whether you are a resident, or not.