Discussion is one of the hardest section in research paper or thesis. It needs experience, learning and practice. It is not a way to restate your results. However, needs to link between your work and others and convince the readers that you work to agree or disagree with other work based on good discussion.
Experienced and seasoned authors have designed their own style, writing plan and article objectives. They are convinced by their approaches and convincing since they are recognized by the famous newspapers. Because of this, they can not follow plans drawn by other people. So the question posed can be rephrased as follows: How can new authors be helped to base their own styles?
You please read relevant papers published in high impact journals and just follow how the data are explained . It is a continuous process and one can always take help from your peers who have proven themselves as good communicators.
I've found the following to be a good outline or good stimulation as food for thought: http://www.biosciencewriters.com/How-to-Write-a-Strong-Discussion-in-Scientific-Manuscripts.aspx
You must look first at your results carefully try to find an explanation why these result happened from real life then write it down if you didn't have any experience in the field of the study set with some one has experience and discuss the results in reality with him . after that go to papers and try to find something matches the direction of your results and support your result with them by referring to them and try to find explanation as well.