Noob WarriorFollow

The last thread I made was about talents, and now I`m seeking help in another department. I`m currently lvl 15, going to be 16 soon. I have 4 quests which are in dungeons. So i`m going to need to party up soon. I`m new to the game, but not new to tanking. I was a good tank in FF11 and I have a couple of tanking questions.

When I group up to do these dungeon quests, my main goal is to keep the enemy focused on me. In FF11, actions you did on the mob was called emnity/hate. Is threat the same as that? To keep solid hate on myself, should I spam heroic strike and thunderclap seeing as the description for that says it generates high amounts of threat? (if threat = hate)

Also, I`ve been doing every quest I`ve come across so far and I plan to continue doing that. Would I be able to do the instances in my quest log now during any lvl or is there a maximum lvl for each dungeon?

And lastly, my health right now is 429 with gear. I`m a tauren btw. Is that high, low or average for my level? To me it seems a bit low, but I really don't know much about the game right now. My gear also doesn't seem up to par as other people near my lvl. All the gear i have now is from quests and mob drops, but I`ve seen a 15 warrior with a 400+ armor shield and mine is only 200ish. And people of other jobs at my lvl have gear with multiple stat increases, where as mine either has 0 or 1 stat bonuses.