Clear off an area that you want to use to plant in. You may want to add a mulch to the ground. I usally do. Add some sort of fertilizer, i used chicken manure.
Put your herb garden in an area that is closest to the kitchen if you plan to use fresh herbs for cooking and canning.
Decide what type of herbs that you want to grow. I use the basic herbs which is rosemary, thyme, chives, and a few otehrs.