The new 529 rules can still benefit you because up to $35,000 can be converted to a roth account if the 529 has been opened with you as the beneficiary for 15 years. So it is worth looking into.

Depends too what the goal is and if it is for retirement or just to learn how to trade single stocks or learning your greeks to options trade. If that’s the goal then I’d recommend the think or swim app by TD Ameritrade and start with paper trading which is playing around with fake money to learn by trial and error.