Read on whatever you intend to write. Do not restrict yourself to few papers/reports/blogs etc. Do not just read for the sake of reading, make notes on whatever you find useful and add your observations, especially when you have different opinion then that of the author/organization. Do not restrict yourself to one reading, especially when the text is comprehensive/important etc EG works of Shubhankar Dam on ordinances. Soon you would find exactly on what to write and how to go about it. Also see how other authors address the findings, analysis and opinion of the previous works. Ask yourself who you would support and why or whose arguments are more satisfactory and can you convey that more persuasively or with more supporting points etc. Last but not the least, be patient, I don't think there can be overnight success with regard to it.