(NEW ON WOW) Where do I get Paladin level 30 armor set?

I'm new on wow and I'm kind lost about my armor set and weapons. I've seen many paladins getting weapons and armor set on level 30. What should I do?
thx

There isn't any predetermined set of gear that you get at level 30 that I'm aware of. However, there are plenty of places, such as dungeons, where you can go and get some decent items to use.