I need advise on word 2007 automation with c#

Hello, I have not posted here before … I hope that I am in the right place. I need advise in automating a report outputted in word 2007 using c#. The report contains charts .. tables etc, the content changes week to week however the document essentialy stays the same .. ie. only the embedded charts and tables change. I am having trouble trying to figure out the best way of doing this … bookmarks .. ranges … mail merge … I am just asking for advise on which way would be a good approach to accomplish this … seems like word automation is a “black art”.
Any advise .. articles .. suggestions would be greatly appreciated.
THanks in advance!

David