How to Write a Literature Review for a Nursing Dissertation

How would you write a literature review proposal for a nursing dissertation on the aerobic exercise effectiveness for hypertension patients in reducing blood pressure?

The introduction should answer the question of why the author chose this topic. The methodology section should explain why to create a literature review. Also, explain how you will search, what databases should be searched, and why these search terms are to be used. Finally, mention what ethical principles are relevant to your topic.