To create a new template, fist create a new document, adjust whatever Styles, etc. you need, add any customizations to the document, then save it as a template, via File|Save As, making sure to choose the macro-enabled template format (i.e. dotm). Form now on, any documents you create using that template will inherit all its customizations (except for the actual macros, which will remain in the template but be accessible to the document) and, if you choose to make further customizations, you'll be able to save them to either the new document or your new template.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]