First of all, you have to evaluate the career options in the field of retail management. Then, you should make a plan to pursue your career in retail management. Additionally, search for the universities which offer Ph.D. degree in the subject.
After that, you have to assess the career opportunities in the field of retail management. You can visit National Retail Federation's website in order to explore the career growth opportunities in retail management.
Apply in the respective university in one or more Ph.D. programmes from the available ones. You can also apply for financial assistance in the university if you require.
You have to register yourself at ETS (Educational Testing Service) for GRE (Graduate Record Exam) or on MBA website for GMAT (Graduate Management Admissions Test). You can download the helping material from the websites. Furthermore, you should prepare well for the test in order to get good score so as to make your position stronger for admission.
You need to finish the admission process by early December of a year in order to start the programme in the fall of next year. Send your applications along with your transcripts and test scores to the universities of your choice.
After getting the admission in a university, complete the courses of Ph.D. Then, conduct your research and prepare your dissertation. You should keep on discussing your work with your instructor who will guide you until the end of your programme.