With Word closed, locate and rename the normal template - If you have not changed the default location enter or copy
%appdata%\Microsoft\Templates
to the address box of Windows File Explorer and you will be taken to the folder that contains the default template - which for Word 2016 is normal.dotm. Note that this folder is normally hidden.

Restart Word and Word will create a new default template.

Open that template in Word. Create or modify the two styles that you require and apply the default to the cursor position. Type a character then delete it. Save and close the template.

Note that Word has a variety of built-in styles which you will not be able to remove from the template. But you can display only the styles used in your document.

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Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com