Heh, YouTube is such a big place!
Best way to start is watching tv news. Hosts have very clear pronuntiation, it's their job after all.
I first research what tv channels are more popular in the country, then search YouTube with that info. YouTube doesn't seem to offer a lot of search options, but it's possible to do the search from Google or DuckDuckGo and later select "videos" tab.
DuckDuckGo has a dropdown menu that allows search localization, so the first results are the most relevant to the selected country. Once you find a handful of interesting channels, you're set up.