In the Hinterlands you’ll find Purple lotus (skill 210, in the troll ruins,) Ghost mushroom (caves, 245,) Golden sansam (260,) and Sungrass at 270. Once you have your apprentice Herbalism skill go to your favorite starting area and start gathering Peacebloom and Silverleaf. Download gatherer database it for free (donate if you want to) and read the documentation. When you’re in any particular zone set your mini-map to show herbs and do loops around the area. The 40 -50 zone: I went to The Hinterlands next, and then to the Eastern Plaguelands. The last area in the Old Word (Azeroth) that you will need to work is the Eastern Plagelands. A very cool addon to use, that will help your herb gathering, is Gatherer. Ok, now you have your 300 skill and you’re ready to hit the Outlands. I went to the Ghostlands, but the Barrens. Fel Lotus (which sells for a nice price) also has a small chance to drop from any of the Outland herbs. Westfall, and Loch Modan are good areas, too.