That's like saying "watch x artist play live and you'll become as good".
Of course studying high rated streamers is good eventually, but honestly not in the beginning.
Wow pvp is very unfriendly to beginners as it often requires you to have a knowledge of every spec, and there's like 36?
So you know how to counter, but the most important is your own class to start with. Yeah, it's a bit tragic arena is such a scary place.