Yeah, Dusty has the right of it. Buying HW isnt enough to continue the crafting quests at level 50 and beyond. You also have to unlock it by completing the patch 2.55 quest "Before the Dawn". I have a friend whos crafting levels got way ahead of his adventuring one, and who bought the expack before he needed it so he could keep leveling up. Sure enough, even if the entire quest took place in ARR territories he wouldnt even be offered the lvl 50 HW crafting quest for any class until he finally got the MSQ to the right stage for it.

Protea, if for whatever reason the duty finder wont match you with the groups you need to continue, you could try to use the party finder instead. Put up an open party, explain what you need to do(___ dungeon to continue story), and you will likely get a group together fairly quickly. Lots of people jump into those groups to help(or maybe are even on the same step themselves). I know i join a lot of those groups to keep my second chance points full for when im working with Khloe. Best of luck!