I understand that your friend forgot to tell you the most important detail that megaways slots have a high level of volatility, so beginners should not play them. First of all, you should try to play regular slots or their demo versions. As for casinos, it is better to choose sweepstakes casinos where you can play megaways slots for virtual currency. I currently play at Zula Casino, you can see what slots they have on their website. But my advice to you is that you should start with low volatility games and over time try to play megaways slots.