If you've only done 1 or 2 collection quests its probably fair to say you've missed half the content.

The only way ive found to get through 70-80 is to suck it up and do 90% of the collection ones, once you get the hang of them they really aint that bad, unless its a awful drop rate or few mobs on a long respawn then I wont bother - especially if I know its not a chain anyway (wowhead will tell you this).

When you get to dragonblight (i think thats the zone) make sure you do -every- quest there basically, they all lead up to the wrathgate and battle for uc which are awesome.