The first requirement to becoming a billionaire by age 30 you have completed already. You have already started thinking about this as a teenager instead of when half your life has gone by.
2. My advice would be to think a little smaller first. This is what I am doing. Think about how you can become a multi-millionaire. Because you are fifteen years old and you do not have a college degree you should drop being a doctor, lawyer, engineer, etc. at least for the next three years. So, what are some jobs that teenagers have that can make them multi-millionaires? Here are some things that I thought about.
- Investing in the stock market
There are no age requirements or college degrees required. All you have to do is learn about the stock market (maybe take some classes), have the money to invest in the stock market, and be willing to take risks. Also, there is a website called investopedia.com that helps people learn about the stock market and how to invest in stock market. So you can learn this for free. You should also ask people you know who know about the stock market for advice.
- Writing a book (mainly fiction)
If you have read tens of thousands of pages worth of fiction books like I have, then you will find it fun to try writing your own series. Then, there is the incentive that it costs basically nothing to write a book and the fact that you can get very rich in a few years if your books are that good. J.K. Rowling, author of the Harry Potter series has sold more than 450 million copies, and that is just one of her series. While it is very unlikely that you will become a billionaire from selling books, you can be a millionaire in no time. Writing a book requires you to have a great idea, good English and writing skills, and the time and patience to sit down and right. I can tell you from experience that the hardest part about writing a book or series is coming up with an idea that no one has taken yet, and the beginning where you have to decide what view you're going to use, the setting, the main character's identity, etc. But, after you have your foundation and establish what the book or series is about, it get's easier. I am speaking from my own experience. I just started writing my book three days ago. It is easier if for me if I outline each of the chapters in the book, so when I come back and write the chapter, the skeleton is already there, and I just have to add the organs. Lol
- Making Apps
How good are you at coding? You've never heard of it?, will I have some bad news: it is going to take thousands of dollars and a lot of practice to become good. Getting coders and designers to make your great app idea come to life is even more expensive $10-20k. I know, I almost broke down crying, when I found out. This obviously takes a lot of dough (money), time, a lot of patience, a great idea, and perseverance.
- Painting
Are you really good at painting? Some of the most basic, bland paintings sell for millions of dollars. You need to be very good obviously, and you also need to have or establish contacts with some art galleries, well-known art galleries. That is where the rich people are. If you don't know any, look it up on the Internet and do some research. Find some phone numbers and call a few galleries and convince them to take a few of your pieces. Even better, get a plane ticket to a place like New York, LA, or Paris where many galleries are located and meet the person who owns the gallery in person. Take a few of your best pieces and convince them that way. You stand a better chance than by phone. This takes talent, money for art supplies, and good rhetoric to be able to persuade people to house your work.
So these are a few ideas that you can think over. I have thought over them, and I have decided to write a book. While you are doing any of these things, keep going to school and learning so you have a college degree to fall upon as backup if none of these things work out. You always need a backup plan.
3. So, I will assume that you have picked a multi-million dollar idea, and you were successful. Let's assume you have a few million dollars by the time you're eighteen. What now, should I still go to college, should I buy myself a house, a Ferrari? It is of the utmost importance that you have restraint and not spend your money as soon as you make it. I would suggest you get a degree in business, or at least learn business, and again ask for advice from anyone you know who is successful at business (accept people like Donald Trump). Write to Bill Gates or Ellon Musk and ask for advice. You should become an entrepreneur, but you need discipline. Wake up every day at 4:30 a.m., get fit, eat healthily. Weekends are workdays, don't stop working. Bill Gates started at age 12, and did not succeed until thirty one, and in that time he never stopped working. Successful people do not watch TV 8 hours a day, or at least not while they were working to become successful. This is the harsh truth, prepare to stop doing things for only entertainment purposes for the next 15 years. If this makes you feel better, think about all the fun you will have once you become a billionaire. And you see how amazing Bill Gates is, even after making his first $10 billion he kept working at Microsoft. This does not mean exhausting yourself and never taking breaks. Rest when you are tired, but train yourself to be a worker and not be lazy.
4. This step is about diversifying your income. Now that you have the money, make smart investments in businesses one at a time. Never spend all your money, and never spend too much money on one investment. Don't invest all at once either, invest in one or two things, and see those investments pay off. Live off of your investments, and as you make more investments increase your income. That brilliant app idea you have, you now have the money to make that dream come true!
So, after attaining your business degree and diversifying your income, observe the world for a second. What do people need? What services can you offer to the world? Is it an online selling platform in Africa? A desalination company that provides water to the Middle East? When you start your company, start off small, and as money comes in, reinvest it into your company. Over time it will expand and you get more profit. Make sure you keep 75% of your company to yourself if you decide to sell shares of your company. The more of the company you own, the more profits you will make from the company. If you don't need to sell shares to get funds so your company can grow, then great! If the services you provide are really that important, you will be a billionaire in no time.
I hope this helped. I am following this plan too, maybe with a few slight adjustments. Some more words of advice, don't limit yourself to this plan. If you see a great opportunity then take it! If anyone has anything to add, please post it in the comments so I and the questioner can benefit. If anyone has any constructive criticism to post, please add it to the comments below so I and the questioner can benefit.