As you're cleaning out the guts, put all the seeds into a colander. Our seeds came from the sugar pumpkin we used to make our ice cream! Make sure they don't have any guts attached to them. I like to give them a good rinse to get that slimy feelings off of them.
If you aren't going to eat them right away, you can transfer them to a airtight container for safe keeping. Just be sure to let them cool completely before putting the lid on. If you put the lid on while they're still warm, they'll sweat in the container and they'll lose their crunch, and become tough. No one wants that.