its a single case study design and I just need to implement the methodology section

its a single case study design and I just need to implement the methodology section. basically I need to add on from what I already wrote at the beginning and with. this all she had as the prompts. In this section, you will write 8-12 pages addressing each of the items listed below (as appropriate for the research method you plan to use for your study). This section will be included in your key assignment for your Advanced Research Method course where it will be further customized to align with the method you are studying.
Purpose of the Proposed Study
Research Question(s)
Research Design
Population and Sampling Method
Instrumentation
Data Collection
Data Analysis Procedures
Rigor
Ethical Issues in the Proposed Study
Summary/Conclusion