If your seeds are very fine, cover them with a fine layer of soil. Moisture and Humidity Germinating medium should be kept evenly moist but not soaking wet. Too much moisture will cause the seeds to rot. Use a fine sprayer to water newly planted seeds and tiny seedlings or, if possible, water from the bottom. If you can, slip your pots and flats into plastic bags to keep the humidity and moisture even and reduce the frequency of watering.
Some seeds require light to germinate while others prefer total darkness.
Your seed packet should tell you what your seed's requirements are. Once germinated, all seedlings need light to develop into strong, healthy plants. Supplement the natural light with florescent bulbs if necessary. The care you give your seedlings in the weeks following germination is critical. Keep it moist, but not dripping.