Customer Journey Maps: Best Practices for implementation

Newcomer 

Updated by Heather Wendt
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!