The first step in research is to identify a topic. Several aspects can influence your choice.
The most important thing is to follow the criteria set by your professor. If you do so, he or she will be the perfect person to evaluate your choice, and guide you if or when this step proves difficult.
Interest and motivation
If you are interested in your subject, your work will be more enjoyable. Be sure to choose a topic that sparks your curiosity. Conducting a literature review is the perfect opportunity to deepen your knowledge of a subject you are passionate about or to discover new facets of a particular field.
Feasibility
Is the scope of your topic realistic, given the available time? Is the documentation you will need available to you? If you’re an undergrad, is your topic too new or too original for enough literature to be available? Is the amount of information to be processed reasonable for your time frame?
Relevance of the subject
Does your research question contribute to a better understanding of a topic? If you’re doing the literature review for a course, does your topic meet your professor's requirements? Is it relevant to the course material? (Rossman, G. & Rallis, S., 2017)
Rossman, G. & Rallis, S. (2017). Conceptualizing and planning the research. In An introduction to qualitative research (pp. 100-126). SAGE Publications, Inc, https://dx.doi.org/10.4135/9781071802694