To watch it, Wirtual and Spam cast it in English. I think there's an official Trackmania cast as well but I don't think it's well viewed. Trilluxe casts in German. These are all Twitch streams btw.

In terms of getting in to it, if you mean getting in to it as a spectator, probably just watching the matches is best really. The format this time is way easier to understand than previous seasons. In terms of getting into it as a competitor, there is a challenger league, but the skill level in TM is insanely high as most of the top players have been playing for 10+ years.