Is a personal training certification sufficient to establish your own business? Is a college degree needed?
While a fitness degree obviously has its rewards; knowledge of biomechanics and anatomy, it often does not provide the practicum, or the personal training one-to-one learning experience.
A degree does not guarantee business either.
A good mentor is valuable, and some detective work on your part about what you want; how you intend to get it, is it realistic , can you do it alone. Think of S.M.A.R.T. goals when you analyze the possibilities.