Splitting shared Apple ID While similar to some questions, I think my question has some unique differences.  

My family (mult iphones and iPads) with 6 people.  We have been sharing a single apple ID as we started before the family plan was available.  

Finally time to split out.  We are setting up a new iphone 11.  


I believe that the apps will still be shared as long as the new phone has a new apple ID connected to the family plan. (correct?) 
But concerned about contacts, calendar, etc.  How can I properly get this  data over?


One thing I've considered is backing up the current phone, installing as is on the new phone with the shared apple ID - and then changing Apple ID on the new phone - but concerned that will then end up with problems.

Any advice from the community how to handle this?
Apps:
All Apps that are eligible for family sharing will be available on a new AppleID that is added to Family Sharing.
Keep in mind that In-App purchases are not shared. More detailed info is available in the Apple Support Article.
A desktop computer (preferably a Mac) would probably be the easiest way to properly distribute the content. Set up both the new and old AppleID and then use the appropriate Apps to move/copy the calendars/events/contacts/...