I've never used QuestHelper, but my friends have and they say it's incredibly helpful. One set of addons I've used that I loved were Lightheaded and TomTom. You can find them here: http://wowinterface.com/downloads/in...ghtHeaded.html
. You can also get an addon called TourGuide which uses TomTom's waypoint features to literally guide you through questing, though the guides are player-made. There are some good ones here: http://www.wow-pro.com/leveling_guid...ourguide_style
Either way you're getting close to Hellfire Peninsula, and it gets a LOT easier to quest once you're there.