You want to choose your herbs when they are just about to flower, when buds have formed but not opened. Gather them in the morning before the sun hits them, but yet after the dew has dried. If you choose to hang your herbs to dry, make small bunches and rubberband them at the top and place them in a brown paper bag and secure at top. Hang until herbs are dry.
Herbs are dry when they crumble off the stem.
After crumbling off stem, place in a lidded dark colored jar for up to one year. You want to use a dark jar because light causes the herbs to fade and loose flavor. Place your herbs on a cookie sheet in a thin layer and place in a VERY low setting oven. If your herbs are turning brown, then the oven temp is still to high. If you are drying your herbs in a humid condition, then stir your herbs a bit until they are dry and for the first few hours of the drying process, have the temp up a tad bit.