Quote from Foz:
The difference between $10k per year and $1 million per year is just position size. The prop traders making millions for Goldman aren't any smarter than you or I, they're just making bigger bets.
Start small. Once you know you can make money, ramp up your size in proportion to your risk capital. Compound your earnings as much as possible. Quit your day job. Start a hedge fund to further leverage your trading skill. Or join a firm and trade someone else's money and get a cut of the profits.