Coherence: The sentences in a well structured paragraph should flow smoothly and logically from one sentence to the next. This can be achieved by using transition words and phrases, and by varying the sentence structure.
Emphasis: The most important information in a well structured paragraph should be emphasized. This can be done by placing it at the beginning or end of the paragraph, or by using bold or italic font.
Adequate length: A well structured paragraph should be long enough to develop the main idea without being overly long. A good rule of thumb is to aim for about 100-150 words per paragraph.
Proper formatting: A well structured paragraph should be formatted correctly, with an indent at the beginning of each line.