U can get the quests once u hit 58 but wont able to get most of them until u hit 60

I hit OL at 58 and was done with all the quests in HH in a day b4 I discovered I had to go back to grinding cos the other quests all need 60.

If you are 59 and need to grind, another good place for the alliance is the deserted armoury place near HH. There is a cliff there and the mobs are lined up along the edge. You call solo pull and kill each of em and slowly work down the line. Plus they drop netherweave too