Customer Journey Maps: Best Practices for implementation

Hi All first post in the community!

I'm looking for guidance on best practices around creating, introducing, and maintaining customer Journeymaps within a Series A SaaS company.

Currently, our customer Journey maps are lacking/practically nonexistent. I'm struggling with one convince our exec team that this artifact is worth having and maintaining, two finding a balance of the quality/detail it needs to have, three a tool that works best for documenting the Map and sharing it across orgs.

Any resources or insights on this would be awesome!