Take extensive notes and prepare a summary table of the articles you have decided to include. See Table 1 on page 138 of Riebe et al. (2017) as an example. In addition to the categories included by Riebe et al. (2017), include columns for results/findings, argument and any other information you think will be useful. Information in the summary table should be paraphrased wherever possible, with any direct quotes indicated with quotation marks and page numbers.
Note that this step will take time, so make sure to get started as soon as possible. If done well, a good summary table and notes will be invaluable when you are writing up your review, and later in the teaching period when you are analysing your data and writing the final report.