iterature review need to include content from at least 10 peer-reviewed articles (in English). You are welcome to add as many other sources as you like.
Please start out with a title of your research as well as a research question (you may also add sub-RQs to help answer the main RQ). The book gives very good advice on what a literature review should contain. The review does not have a specific scope in terms of pages or numbers of words. The important part is that you demonstrate that you can use the literature to define (and maybe discuss) your topic and core concepts – and can point to relevant previous research within your field.