Series of articles - Create a series of articles on your blog if the subject you choose to talk about is an extensive one.
Formatting - Your post need not be a circus. If you are not good with formatting, then stick to a theme that is light and descent in colors and the post layout. If you are good with trying new stuff then use that skill to better express through colors, fonts and layouts. Avoid colors that are dark and fonts that are overtly bright.
Put advertisement but make sure that your blog visitor doesn't get irritated when ads pop up one after another like a flood.