As a franchisor you will be building a brand with a reputation that other people will want to buy into. You will, therefore, need a brand which is distinctive and appropriate for all the places you would want to have franchisees in operation.
It will also be your responsibility, and your obligation to franchisees paying for the benefit of using your brand, to protect it against abuse, both by outsiders and by ex-franchisees. You will, therefore, need specialised advice on protecting your trade and service marks.