Nepenthes seeds should be started on chopped sphagnum moss in very damp but not wet conditions. It is best to spray the sown seeds with a fungicide. Cover the top of the pot with clear plastic so the humidity will remain high.
Place them in an area with really nice strong light and keep the temperature around 32°C/90°F.
When you see some tiny plants starting to sprout, slowly open the top of the pot, a little each day, so that the new seedlings don't go into shock from the humidity being lowered too quickly.
Germination usually occurs in a few months, but it can take longer, sometimes nothing can happen for a year, don't give up. Make sure that it gets good air circulation.