The first step involved in planning to further your education is an understanding your motivation to do so. Understanding your motivation will help you make decisions and keep you on track.
Motivation provides the energy for focus.
Focus concentrates your powers, efforts and attention to get you from here to your goal. Research what you will need to do in order to reach your goal and develop a plan. You may have some tradeoffs or adaptations that you will have to make in your personal and professional life. Discuss these honestly with your family and friends. Find out if the school has any support groups for adults that have returned to college.