Creating Effective Onboarding Slide Decks and Collaterals

Customer Onboarding Change Management and Internal Comms I've been looped into an exciting project to help our onboarding team with creating a slide deck and 1 sheeter that our champion would use to help their org get aligned right before implementation and onboarding. Think advice to the champion as well as collateral they could use themselves for cross-functional meetings. Anyone have this /do this before? I've got some ideas but would love examples of things that have been successful.