Water your herbs sparingly. Herbs don't like to sit in wet soil and drain your saucer when excess water accumulates.
To test if your plants need water, poke your finger in the soil about 2 inches down, if the soil is wet don't water, if the soil is dry, lightly water.
Always try and water until the excess drains out (then remove excess water). If you repeatedly give your herbs water, a white salt film (looks like white mold) will accumulate on the top.
Feed your herbs every other month with a fertilizer, like this one, that is labeled for food consumption.
Try to avoid cutting your herbs until you see new growth. Once you do, you can clip about 1-2 inches from the herbs as needed.