Start with reading previous research in the field you are intersted in. It will help you to find a research gap and formulate a problem as well as give you ideas about what is needed to be done on your field. Focus on the suggestions for the future research.
I fully agree with Dr. Olga Rauhut suggestions, think carefully what your subject will be and study about it to see where is the current research going, have in mind that the subject you choose will follow you for many years in your career, so first thing would be to choose a subject you really like and are interested in.
Look at how your research is going to impact upon your future. At the end of your research, you should be an expert on the research topic, and so you ought to consider building on your current expertise and interests into an area that will open up areas for future research, business or professional opportunities.
Do not expect a research topic to appear without a lot of soul searching and effort. After all, this research is going to consume your life for a long time when you are doing the research, and potentially have a long life after you have added your "one sentence" to the existing body of knowledge. Good luck with your efforts.
I agree with Mr. Riley's comments and suggestions. There are lots of possible research topics which you should be an expert on eventually. Google Scholar is one source of information. Good luck on your journey as a future PhD.
What is the gender gap in leadership and how is this influencing companies' bottom-line results? - could be a starting point of your reflection process.
Take into account that women occupy more than 50% of all management and professional occupations, yet at Fortune 500 companies, they hold only 19% of board seats, 15% of executive officer positions, and almost 6% of CEO positions.
- Tracey Manning (2002) Gender, Managerial Level, Transformational Leadership, and Work Satisfaction, Women in Management Review, Volume 17, No. 5, pp. 207-216.