Both good suggestions, but, I have one that will help ya a bit more. Add ons in WoW are allowed and looked on with wonder and awe.
Go to google and type in a search for WoW Matrix. Download it and run it. There is a tab there for all kinds of add ons. A few I would suggest are Lightheaded, double wide and tomtom.
When you bring up your quest log (if you are running these) instead of the normal 2 panels, you get 3 panels to look at. Left is the different quests you have, center is the one you have high lighted, and the 3rd (on the right), holds comments from wowhead users put there by folks who have already done the quest! They tell ya what to expect, and how to finish it.
As an added bonus, while you are reading these, when you see 2 numbers in blue, if you click on them, it adds a waypoint to both your mini map and your world map so when you open your world map, it will have a green dot at each location for your quests!
So you go to an area, gather all the quests you can, open up the quest log, go thru each quest, clicking on the blue coordinates. When you finish doing that, you open your world map, and all the little green dots now show where your quests are.
Setup a route to follow and you are now good to go.
Hope this helps.