I want to start a business later in life, how do i start?

Im in high school, and in my life I want to get an art degree in concept art. However later in life like when im 40-50 i want to start a business. Like a book shop or a coffee shop in NYC.
Thats one of my life goals. As a student in high school, what should i be doing to change my work and study habits? So i can go to business school after high school.

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