You will search for systematic reviews related to yours. If you find any, you will need to evaluate them and include that discussion in the "Background" section of your review. Use one of the following resources to evaluate quality of related SRs:
Gray Literature is probably one of the trickiest parts of the SR, and you may not need it for your assignment. However, if you do, see this fabulous guide from UPenn on finding, evaluating, and using GL.
These tools will allow you to:
RefWorks - Free to you. Supported by the HSC. Web-based.
EndNote - Costs about $80 for a personal license through TechZone. Creates a local library on up to 3 computers. Libraries sync through web application.
EndNote Web - Free, web-based application.
You will need to chart the flow of data through your review in order to maintain transparency and allow the reader to determine whether your process was valid. PRISMA is an evidence-based minimum set of items for reporting in systematic reviews and meta-analyses. PRISMA focuses on the reporting of reviews evaluating randomized trials, but can also be used as a basis for reporting systematic reviews of other types of research, particularly evaluations of interventions (from their site).
PRISMA Flow Diagram