As Phanx said, the default UI does indeed do a good job. But maybe you want to see trailing ants over your map to your objective or something like suggestions on what to do first?
There are guide AddOns out there, but I won't give you their names as they charge you to download. If they would actually provide their guides for free, then maybe I would actually consider donating to them.
Other then that, isn't it fun to find out the best order of doing quests yourself?
