I want to support an existing business by providing services in the area where they lack so that I can get a business for myself.
Supporting an existing business is a great way to test the market demand for your services. If you contract with an existing company as an independent contractor (rather than diving in and buying part of their business), you maintain your autonomy, test the market, and keep yourself open to deciding in the future if you want to invest in the existing company or truly branch out on your own.