Paragraph Styles
In this section I will go over each 'style' of font and recommended size. Proper use of these functions will allow you to make a cleaner looking guide.
Titles/Headings Titles and/or headings are, well, where you would write the title of your guide. Example would be: Leveling Guide 20-30. Use font size 5, bold, and legible font.
Anything bigger and it starts to get in your face. Getting attention is good but if they're reading your guide you've already gotten it, no need to drive them away.
Sub-headings Sub-headings are for different sections in your guide. Taking from the example above a sub-heading may be: Level 23. Use either 3 or 4 font size, bold or normal.
Content The meat of your guide. This will be the descriptions for each section. Usually the default font size of 2.
Discretionary/Comments/Etc You can use the smallest font size for side comments and discretionary messages such as "do not use this guide without permission" and so forth.