To get started, open your document in Google Docs.
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Margin options will be under the Page Setup Dialog. To open this, select File at the top left corner of your window.
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Then select Page setup from the drop-down menu.
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You will see your margins here. The default for Google Docs is 1 inch. To change them, you'll have to set the Top, Bottom, Left, and Right individually.
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If you want half inch margins, you would type "0.5"
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Repeat this for each margin.
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Once you have all of your margins set, hit OK to confirm the changes.
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Now you will notice that your margins are much smaller. Feel free to tweak the individual margins to get your desired level.