A Note About Formatting: Outlines usually follow a specific format using parallelism, Roman Numerals, upper case letters, and sometimes numbers to indicate ideas with different levels of importance. Unless your instructor is planning to collect and grade your outline based on proper formatting, try not to get too hung up on making sure that you're formatting each section properly. The important thing to remember is that the outline is meant to be a helpful organizational tool --compose your outline in such a way that it will be helpful to you !
For an excellent source on English composition, check out this classic book by William Strunk, Jr. on the Elements of Style. Contents include: Elementary Rules of Usage, Elementary Principles of Composition, Words & Expressions Commonly Misused, An Approach to Style with a List of Reminders: Place yourself in the background, Revise and rewrite, Avoid fancy words, Be clear, Do not inject opinion, Do not take shortcuts at the cost of clarity, … and much more. Details of The Elements of Style by William Strunk, Jr. partially available online at . Note: William Strunk, Jr. (1869–1946). The Elements of Style was first published in 1918.