I am a middle school English teacher and teach students using literature and expanding writing skill.
I would wake up at 6, and get to work around 7:30. My day would start at 8 am, and I would have three classes throughout my day. We would read all kinds of books that would express different ideas and could teach aspects of stories and writing skills. I'd have interactions with students, and could also work with other teachers and form relationships with the people I work with. I would have lunch in the afternoon, and more classes after that. We would also do lots of writing.
I feel like you need to have the ability to relate to all sorts of people, since every kid is unique. I would need to be flexible, and have experience working with others often. Also, I need to be used to a set schedule for my day.
Here's the first step for high school students
Make sure to take classes that relate to what you want to do, and find experiences that make you interact with other people.