level him to 85? I just recovered my account and dont klnow what to do in Cactclysm and im having trouble finding whats good or not good? help?

Well for dks the dps classes are frost and unholy and I thinks it's better to dual wield now, and the tanking spec is now blood

As Alex said, the best option is that you do instances and raids and when in queue go questing or something and you can get good gear out of quests not to mention gold and flipping (playing) AH.
P.S: Cata raids are way harder than WOTLK raids so they need a lot of training.

I'd say instance, instance and ummm....instance. When you aren't in an instance, quest while waiting in the queue. That should move you along quite well. When you aren't playing WoW, i suggest also putting your toon in a major city or inn so that you can become well rested. You get more xp when you're are well rested! Hope this helps...happy WoWin'! =D