If someone who is not that knowledgeable about sports and gambling but wants to do sports betting, what would you recommend for him to start learning first? Do you advise him to go and watch sport matches and learn how it goes first or go to online casinos and learn about sports betting? Will he someone with sports knowledge be more profitable in sports betting or will someone with gambling experience come out on top?
The best advice would be don't start betting at all. If he does not want to listen, then he should start reading proper analysis online and not spend his time watching matches thinking that he's gonna become a smart analyst in his free time. Here, of course, I would tell him to watch the match well first. Because watching more and more matches will increase your experience, and the more games you watch, the more your analysis skills will increase. This means that you can predict in advance which team is likely to win next, because you have seen their previous games.
You think that watching a couple matches, or even couple hundred matches gives you analytic skills? 
Your analysis skill after watching 1000 matches is closer to 0 than it is to 1. What kind of delusions gamblers tell themselves are amazing.