Using MS Word 2007 to create company newsletters?

Hello! I am using MS Word 2007 to create company newsletters. I'd like to find out how I should save the files (as doc, pdf or xps) and how should I "attach" it in the Email (our company use Gmail)so the newsletter will show in the body of recipients' Emails, but not just as an attachment that you need to open in order to read it? Thank you!!!