Crafting & Professions, Part 3: Gatherer and Secondary Skills

From BradyGames' World of Warcraft Official Strategy Guide

Gatherer Professions
The skills of Mining, Skinning and Herbalism are gathering skills. You won't be making anything, or need to make anything, to gather. These vocations supply other professions by providing resources necessary for them to ply their trades.

Herbalism
Your first skill is Find Herbs. Drag this icon from your ability book (P) into your hotkey bar, then hit the corresponding number or click it to activate it. Once you activate it you'll only need to refresh it on death or after logging in.