The default text in a Google Doc™ is "Normal text.' Utilize the "Heading 1", "Heading 2", etc.. to organize your document. If you want to print out the outlines you can use Document Outline by Alice Keeler to send only the headings to a new Google Doc™. 

Giving a presentation and want to outline your ideas first in a Google Doc™? Document Outline by Alice Keeler will also send the headings to a new Google Slides™. Normal text in the Google  Doc™ will be added into the speaker notes. 

Make a Google Form™ faster by creating the questions as headers in a Google Doc™. 

You can also send the document headings to a Google Sheets™.

Check out more of her Add-ons at http://alicekeeler.com/codedbyalice