Phd.: You need to decide what areas of research interest you and find a supervisor who shares your interest. You then, with the help of the supervisor need to define a coherent research proposal which is both novel and achievable as a PhD project.
Benefits of this program:
PhD is first and foremost an academic research qualification. If you wish to work in an area not closely related to your research specialism, whether inside or outside academia, then you should think very carefully before doing a PhD.