HoR is a right bastard until you've learned its ways, but as you have taste and good sense enough to roll a dwarf warrior in the first place, I'm confident you'll be able to handle it in time.
There are various strategies for the first two bosses. I tend to have my group snuggle in a corner of the alcoves behind one of the bosses. It's important to look around and see what kind of mob are awakened at each spawn as all spawn at the same time, but their distance to you vary and so they tend to arive one after the other with enough space between them that you can fit in the gcd of a devastate or shield slam or what ever. If two arive close together, use TC, once you have all of the melee, use shoickwave and then start charging arund to get a handle on the ranged. You can charge the mage, shield slam and intercept back, and you should have enough threat to keep it on you with spell reflects. It's not dangerous to run around on the floor after the mobs have spawned, and you should use the warbringer talent for what it's worth. Some times, you'll get a team member that cc's a ranged mob or LoS's it into melee range, but at least in my experience, that's the exception, not the rule.
I use my Shield Wall on the first boss and then on the last pull before the second boss as I tend to take a lot of damage on those.
But the most important is to look around as the mobs spawn and adjust your tactic then.
Groingnasher of (EU) Quel'Thalas