Last week, I listened to Mr. M's lecture, he is an English teacher at junior high school in Japan. His advices are very useful for me and people who want to be a teacher, so I tell you about the information you'll need to work at a school.
Fast, in junior high school, English makes a point of "communication". You may think communication has only conversation, but it's a mistake. Writing and reading are also important for "communication".
Secoondly, before you teach , it is important to decide goals of each subjects through the three years. You should think what skills do you want students to learn in three years. If you do so, you will be able to think classes'contents easily.