Font Style -- Stop using Times New Roman and switch to a Century Schoolbook-type font for text. For headings, use a sans serif font (e.g., Helvetica or Arial).
Spacing -- Stop using your word processors default "double spacing" which inserts too much space, and use 1.2 spacing.
Margins -- Use 1.5" margins on all sides
Alignment -- Use Left aligned text. Stop using fully justified text.