What you want depends on your philosophy. What you can do depends on your circumstances. Wherever you touch education, it fades into something else. The aims of an educational system are the aims of the society in which it is conducted. The philsophy of education is merely moral and political philosophy.
Educational psychology is nothing but the psychology of learning.
When we pass from the general subject of education to the more particular one of teaching, we are no better off. The teacher has to have knowledge but not knowledge of education or what purports to be knowledge about methods of teaching gained from texts prepared by professors of Education in universities. The teacher has to have knowledge of the subject that he is attempting to teach. In addition, it will be helpful if he knows how to write, speak, and figure. It will be helpful, in short, if he knows the liberal arts, which are the arts of communication.