If you worry that much, maybe start with demo versions of games? I’ve seen that some casinos offer those, so you can try and play without money first. That way you’ll get used to it and see how it works.
I think demo versions are kinda lame. The whole point of gambling and casinos is in the feeling of thrill, risk, tension and all that. Adrenaline too. Otherwise it’s just some mini games where you click one button.
Real money gambling CA is valued exactly for that. You’re scared to lose your money, you’re tense, you’re waiting for the result and all that. Going back to the post, I think you can’t really prepare for gambling, but you can set aside a certain amount you’re fine losing, decide how many bets you can make, basically control your bankroll.