First of all, Alchemy is a Shaman only skill gained at Level 25. This will save big cash in the long run. This potion is trivial to make. If you look at the above chart carefully, you will see that certain herbs effect specific stats. For instance, Lucerne boosts Strength while Sage Leaf boosts Stamina.
Some herbs have a catalyst effect.
That is, they increase the strength of a potion itself. A quick word about intelligence and wisdom. The higher your intelligence is, the faster you will raise your skill. I've heard it recommended that you shouldn't try to train in a skill without a minimum of 100 Int. For us Shamen, that's not always easy to acquire.