Entrepreneur

Hi everyone, I hope my post isn't annoying but ATM I am kind of conducting a research for my specific case.

I don't know where to start to be honest with you but I got a call yesterday from my brother and that man pulled of the impossible, infact it is so impossible I can't explain it without sounding like I am lying but here is a summary: He is in control of a mother company that is kind of like a social experiment for people so rich they can take down the government with one phone call for the sake of figuring out what the new generation can do in order to harvest they're creativity and keep up with the advancing world so their kids can keep the generational wealth on going and they are currently giving them anything they need they are kind of like a dude in creative mode on minecraft and if u need anything no matter what is is they will give it to u (I am from a contry that is messed up very badly so they can do anything pretty much). Idk if any of what I said made sense but I don't want to make this post to long. He wants me to be a part of the company because well He is building the elite team and I am in it and my role is going to be kinda of like the eyes of the company, he wants me to learn these 3 things Media, Advertising and Marketing and he said he wants me to use it with what I can do best which is data science and he wants me to become expert enough to kinda be the guy who he calls to ask if he should do the decision or not I am kinda gonna be a joker who does everything, I am going to be the nervous system + the eyes.

At this point I need to become expert enoughin this and I want to know what I should learn to be ready and in shape for my specific case.

Thank you everyone in advance.