Sow the seeds on the surface and then cover them with a thin layer (~3 mm) of the germination medium. This layer stabilizes the young seedlings when they start to put down roots. Put the container inside a bigger container with a lid, and soak with a fertilizer solution with normal concentration for ~1 day. Close the lid to prevent pests like fungus gnats from hatching eggs in the medium. After that, take out the container and seal it in a clear plastic bag (for example, a zipper storage bag). This will keep the seeds in a fully saturated humidity. Keep the container in a bright place without direct sunlight. The first seeds will germinate in ~3 days and the germination goes on during the next weeks.