You may be doing a systematic review as part of you course or you may be looking to publish.
Consider the following if you wish to pursue publication of the review:
To help with the writing up part of your systematic review take a look at other reviews published by the Cochrane Library to see how the results should be presented.
Use the same types of section headings and format - it is a tried and tested method.
You should be very clear about:
One school of thought is that a meta-analysis is a better option for a review but it is not always possible to do this with the results you find. You need to justify what you have done. If you do a narrative analysis and a meta-analysis was possible, then one of your conclusions might be, that the next step should be to carry out a meta-analysis but say why you did not do this initially.