Summary
Following the opening, furnish the details; provide, describe, and analyze whatever information or instructions are relevant to the subject at hand.
The key is to present the details in an uncomplicated manner. The reader should be able to quickly single out specifically what is most important for him or her to know.
This can often be done in a bulleted list, however, it is important to avoid going overboard. Lists by nature are short on context. They are great for simple messages but, nevertheless, you must supply enough information for the list to make contextual sense.
More complex messages can be broken into subsections with descriptive headings printed in bold, underlined, or italicized.