Text
TitlesYour titles need to explain what the body is going to explain. Who wants to have to read many paragraphs just to find out what it is about? This will help organize your guide and help users find what they need. This must contain proper English.
BodyThis must be very description. Act as if this person just know found out what the inter net was. Don't assume they know to click this or that or to type in this. Use proper English and grammar. A body full of chatspeak, stickycaps, and 1337 will make a user not want to read.
Colors
MatchYou want your guide to match. Simply pick colors that work well together.
TitlesAll titles should be the same color and stand out more than the body. Brighter colors would be nice but still able to read.
BodyAll bodies need to be the same color. It is best to use the basic black. It is easy to read on any computer color set up. Bright colors are the WORST to write for bodies. No one will want to struggle to read a paragraph. If there are important details that need to be noticed a color maybe not the best thing to do... Possibly bold the text rather than coloring.
Size
TitlesTitles must be a large size! They need to stand out. My suggestions is to use Large to X-Large. Bolding and Underlining are good as well.
BodyIt is good to have the body a normal size font. Smaller may make it harder to read. Bolding, italicing, or underlining would be good if they are important.