To change your default margins:
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From the Docs menu, choose File → Page Setup
- Set the sizes to whatever you like, then click “Set as default”.
Change your default font/style:
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Open a Google Doc, type some text and change the font, size and/or color to look how you want your new default text to appear.
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Select the text you have typed.
- From the Docs menu, choose Format → Paragraph styles → Update “Normal text” to match.
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Choose Format → Paragraph styles → Options → Save as my default styles
Do this once, and think of all the time this will save you making your documents look pretty every time you write something.