Need help on Eve of Ruin Spelljammer chapter

Hello! I am new here and very unfamiliar with Spelljammer as a setting, but I want to try and learn more about it. I’m running Vecna: Eve of Ruin for my group of friends and we got halfway into the first chapter, so I have time to work on some future stuff.

But basically I want to ask more about what makes Spelljammer the setting it is, but I don’t know much about it. I don’t have the books but I do have a supplement (Monstrous Compendium Vol. 1: Spelljammer creatures) and my friends have the books. But I want to know what all to add and what to flesh out. Any advice? I’m always ready to listen!