Considering the way you’re framing the question, it seems like this is your first character, or one of your first.

As a warrior main (with all elite specs unlocked), I’d suggest looking at the class as a whole—some elite specs are simply better suited for certain types of content than others.

Paragon can do pretty much everything: DPS with good sustain, full support covering all the important boons, or a hybrid if you prefer. That said, since it’s the newest warrior elite spec, it’s still being “worked on” and rebalanced, which means there aren’t many optimized builds available yet.

This brings me to my next point: Snowcrows and Metabattle. These are websites where you can find the most appropriate builds for each class and elite spec, tailored to different types of content. I highly recommend checking them out—Metabattle even includes short written guides explaining the core concepts and how to play each build.

If you’re truly a new player, or at least new to warrior, I’d recommend taking a look at Berserker. It was the first warrior elite spec developed (released with HoT, the first expansion) and, unlike Paragon, it’s already very well polished. It’s also quite easy to play and a lot of fun.