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You should major in Business, with an emphasis in Finance or Management.
You will learn the basics education foundation which will prepare you for M&A
and then you can buy/own a "broadcasting network."
If you prefer to get some experience now, I would look into YouTube
as they are the equivalent of what "HBO" was when they started. I
am certain, after looking there, you will find much knowledge
about starting, buying, managing a broadcasting network.