First, examine your topic to identify the major concepts you need to conduct the best searches. Some useful ways to do this include thinking of who, what, where, when, why, and how, regarding your topic of interest.
To arrive at a more or using the PICO(T) method: Population/Problem, Intervention, Comparison, Outcome/s, (Time frame).
Document Your Systematic Literature Review - research question, criteria, info sources, search keywords, searches
Systematic Literature Review Templates for documenting your question, criteria, information sources, search strategy, and searches: