I take pictures of people.
I would start with going out and finding people to photograph. Early afternoon I would go back home to work more on editing, post processing and take care of emails and marketing.
Here's the first step for high school students
You should feel an attraction to images and story telling through them. Then you should start taking photos and see if you enjoy the process. If yes, then you should study photos from photographers you like and also study art and composition.
"You should be an architect."