Here is the site I started with: http://word.mvps.org/FAQs/MacrosVBA/index.htm



Here are three books that I'm using:

• Word 2007 Document Automation with VBA and VSTO by Scott Driza
• Mastering VBA for Office 2010 by Richard Mansfield
• Word 2007 Macros & VBA Made Easy by Guy-Hart Davis

The first book looks at Word using both vba and visual studio.
I still use Writing Word Macros by Steve Roman, from O'Reilly even though I think it was written for Word 2000.