You will probably get a lot of feedback on this, and some of it will be contradictory to others. In my opinion it’s best to get to the heart of it, and know how to know. I recommend checking out the FIght Club discord (https://fightclub.academy/) and diving into the theory behind the reasoning at some point.
Deep arms is a pretty common starting build, as it offers some great choices that are helpful for tanking as well as DPS, and world pvp (though, expect to get kited a lot, esp prior to learning intercept).
I put together a low level tanking guide you may find useful, that is pretty relevant until you may decide to respec at 60, and focus on more end game stuff.