The type must be of sufficient quality and size that it can be easily read. Laser printer preferred. Grammar and spelling must be correct. Remember, a spellcheck program catches only typographical errors. Paragraphs must be used appropriately.
Some people tend to go on for two or three pages with no paragraphing.
A paragraph is meant to express a complete thought or idea. All sentences within the paragraph must be related to the single unifying idea. Three or four paragraphs per page is normal. Start a new paragraph when you start a new idea or shift to a new subject. Avoid the use of sexist language, i.e., that which speaks in only one gender.