Its all optional arguments but these are what they are in 200+
.Documents.Add([Template], [NewTemplate], [DocumentType], [Visible])
You can specify a template to base the document creation upon, specify this is to be a new template, doc type has several types it could be, and if to show the document or make it hidden.
All these arguments can be seen in the Object Browser of Word and help file too for more info then what I posted. .