I haven't tried that bankroll thing, and I wish I could learn that kind of in investments aside from gambling with online bets like sports betting. My friend told me about that investment at gambling sites who had bank roll system for their gambling site. I dreamed to gain full knowledge about and hope this is more profitable than playing gambling games.
Why don't try on yolodice? Afaik they offer you investment option too for all people. While you invest, i don't think yoy need to get full knowledge about that, just find a trusted gambling site, deposit your money and let it go.