I’m 23 and wanna get my little bro (13 yo) interested in investing. What’s the best way to do this?

I’ve taught him very briefly on what stocks are and how they work and he seemed easily interested in it although he doesn’t truly understand. I told him the risks and whatnot and that I can invest for him with whatever amount of his money he’s comfortable with. He gave me $150 and he’s down for me to DCA into VOO and MSFT. $150 maybe a lot for him but he doesn’t pay for anything and it could be a good amount to stay interested and becoming responsible (better than Vbucks). Does anyone have any takes or advice on this?