In order to determine a good direction, on the one hand, you can find more relevant books and research to have a good look, because the doctor is actually not attending classes, but doing research, and you must have certain research projects and experience to apply, otherwise the doctor will not be able to apply. You can also find the contact information of professors and application committees of those schools in which you are interested, and contact them in advance to ask about their research interests, key points, students who are inclined to enroll, etc. Get each other's goodwill and trust. This is called rhetoric.
After you determine your own direction, you need to go to the relevant schools to inquire about their conditions for accepting doctoral students. Generally, you need to take GRE and TOEFL, and the school will give you score requirements. Then there are letters of recommendation, as well as the introduction of the research you have done, your research proposal, your personal motivation and so on. In addition, if you apply for a doctorate in education management, perhaps your school experience can help you win the favor of the application Committee; But in this case, you have to go to the school to get a work certificate, and you have to go to the principal to get a certificate or recommendation letter, so you need to say hello to the leaders of your school first.
General schools have an online application system. What you need to do is always pay attention to your favorite school, fill out the online application materials before the deadline, and then upload the scanned copies of the above documents.
Finally, good luck! I am now a graduate student in education. I plan to be a teacher for a while after graduation, and then go out to study for a doctorate in management. Later, I went back to school to engage in management work. But I think if you really want to do something, you'd better stay at school. Even if you go out to study for a doctorate, you may not be able to go back to middle school when you come back, and the university may not hire you, depending on whether you have any research results. So I hope you think twice before you act!