One way to develop a paragraph is to go from general to specific topics. Another way is to present ideas and events in a chronological manner. Various papers have suggested anywhere from 3-5 sentences or sometimes more. Another guideline is 2-3 paragraphs per page. These things make it easier for the eye to find the beginning of the paragraph and save the reader time and effort.
Paragraphs are also easier to read if the right margin is irregular.
However, the instructions to the author of various journals may require other formats. It is useful to use transition words and sentences to help the reader see the relationship between paragraphs. There are several ways to do this. One way is to tell the reader at the end of a paragraph about the next. Another method is to use a word or phrase in the last sentence of a paragraph and then repeating it in the first sentence of the next paragraph.