These guides are made to help you gather herbs you may need for your chosen professions. Each guide has detailed maps of the best farming places.
Herb Farming Guides
I recommend trying Zygor's Leveling Guide if you are still leveling your character or you just started a new alt. The guide is in a small window on your main screen in-game. All the detail that you need to complete the quest is included. You’ll never have to switch back to a website or even the in-game main map to see where you have to go or what’s next. The guide is available for both Horde and Alliance.
I use Zygor's guide for leveling, and I highly recommend it.