Back in the days you might have found a guide useful but there really is no need for it now. Blizzard has gotten much better at their zone and questing design almost to the point where you can't really mess up regardless of which direction you go. Grab questhelper addon and take a few seconds to read the quest text before you head out you should be able to knock levels out fast enough. If you come across a collection quest hit your favorite site and see if the chain is something you want to do.