Review your notes and organize them according to content.
Build a tentataive topic outline. Consider the various ways you can order your content.
Fill in your outline with notecards. Noodletools is great for this. See tutorials below.
Within each topic heading, flesh out your notes, pointing out differences amoung studies.
Begin to write, using your own words.
The introductory paragraph should establish the importance of the topic, provide definitions.
Write an essay that moves logically from one point to another. Do not summarize one article after another.
In the conclusions section, point out gaps in the literature and why they are important. Add suggestions for further research, if appropriate.