I'm searching for some sort of document template or guidelines to produce a document that describes data flow, high level data field definitions, data ownership (who produces the master data), etc.
Not really a data dictionary but something intended for business users (non-techie) who are stakeholders in the project.
Anyone know of any such template/document style or will I need to define some sort of custom document to fulfil this need?
You can use the "4+1 View Model".
See http://www.ibm.com/developerworks/wireless/library/wi-arch11/
See http://www.cs.ubc.ca/~gregor/teaching/papers/4+1view-architecture.pdf
The point is to write from a user's perspective.
Use Cases.
Business Entities. Not Tables. Real Entities. In the Real World.
Processes. Not Programs. Real Processes that Real People Really Do.
Physical View. Computers and Disks and stuff. This is more of an appendix than anything else when you're addressing Users and Requirements. Later, you can elaborate this into technical details.
Development View. None of the user's business. A part of the total package, but not relevant for high-level discussions with users.