Pumpkin seeds. like tomato seeds, have a slimy coating that needs to be removed first. I started by removing the amount I wanted and placing them in a bowl with a small amount of water.
After a few days they developed a bit of scum on them. The scum helps to rid the seeds of their coating. The next step is to place the seeds in a colander and rinse them thoroughly. They are then put on a plate to dry thoroughly. You need to dry them a bit more than you might think. I leave mine on the plate in my kitchen for a few days.
When they are thoroughly dried, you can package them into envelopes or other containers to await planting. If anyone wants a few seeds, let me know and I'll send what I can off to you.