[Astromancer]

My advice is to find a niche for the beginning of your campaign. Law enforcement on the moon, forensic psychologists dealing with the special problems of parahumans, or thrill seekers on Mars that have accidentally run afoul of the Martian Triads, something that would appeal to your players. This would give you and them time to acclimatize to the broader setting.

Exploring the depth and complexity of the setting can wait. Fun first, fun always.