My best advice for a new Gladiator, and I'm still somewhat new myself, but learn to "mark" mobs, in other words you need to mark at least "1" for the mob you're focused on killing, it will help you a lot with hopefully the DPS following your "marks". If you put a "1" on a mob, the DPS should focus on that mob first. Very basic, and very helpful, especially for new Gladiators. You can "hotkey" the "1" so that you can do it quickly and easily. Sometimes it's best to kill one mob first over another, as you progress you'll learn more about that. You can also "tab" between different mobs to make sure your "hate meter" (bar on the left of your party health bars) on the mobs is high for you.