If he has a favorite sport which he follows up by watching the match or updates, he can easily bet on that sport. If he doesn't, he shouldn't think of sportbet but should go for casino games like slot which is 100% pure luck. Since he is new, he can start with the demo in order for him to understand how the game works before betting with real cash.
Yeah I think starting with the demo mode is the best idea, because if he choose to
learn in the processstart betting with real cash he's going to lose more money before he will understand how the game works. But I can't recommend him to go into casino because casino is very addictive and very consuming, As a newbie he's supposed to be looking at sport betting because I'm sure that he's familiar with most of this clubs. As a beginner once you're familiar with this clubs the only thing you need to understand is the options, I know this may take some time before they can be able to understand it. But he just need to keep learning until he master the regular options before getting started.