You don't need any code. Create new Normal Template
document and send it to your client.
A Template is a document type that creates a copy of itself when you open it. A Normal template
opens whenever you start Word, and it includes default styles
, AutoText, macros, toolbars, and other customizations that determine the basic look of your document.
Change the Normal template (Normal.dot)
Change the Normal template (Normal.dotm )
Save a Word document as a template
Using macros to set default font is a... bad idea ;(