How to start writing chapter three of research.
Your question is an enigma, but without further explanation, I can at least tell you how to write one of the middle paragraphs in a research paper (although I'm not sure if that is what you're asking).
In the middle paragraphs of a research paper, each paragraph should be dedicated to a particular support of your main thesis. The very first sentence in a middle paragraph should be a "topic sentence" that generally describes what you will prove and/or discuss within the paragraph.
For example, if your research paper is about how Jane Austen's works are always autobiographical, perhaps one of your research paragraphs might start with this sentence: "Jane Eyre, just like Jane Austen, was a woman with education who valued her own thoughts." This paragraph, then, would contain the research from the book Jane Eyre as well as autobiographical info from Austen's life that proves both things. I would probably include a quote from a primary source (Jane Eyre) and a secondary source (biography) in order to cement the proof.
Thus, after the topic sentence (in a paragraph of a research paper), the paragraph should contain at least three supports.
An academic paper may require both primary and secondary sources. Primary research means working with original documents or gathering data in the field. Secondary research means finding out what others have learned about a topic.
This means quotes and/or direct examples from both primary and secondary sources that first support what your thoughts were in your topic sentence and second support what your main thesis is.