QuestHelper is a really nice addon for WoW. It adds in game information that allows you to completely a series of quests quickly. Once you have some quests, this add on will show you on your map the shortest travel path to do all of the quests you currently have. It also lets you know what you need to do to complete the quest.
The following video will show you everything about it; from installing it to its in game use. The video shows you how to search Google to find it, but I’d recommend you use these direct links: