The very first step for data-driven journalism is to know where the data is. The number of available resources is increasing strongly, many statistical offices around the world are sharing their findings.
At best you should automate this process: For example, create a folder in your mail program based on rules where you add all the daily updates coming from sources like the World Health Organization, The Worldbank, International Monetary Fund. Then go a level deeper and focus on your national statistical office. Usually all these sources have press offices and areas on their website where they publish on a daily basis.
Tipp: Use either "Google Alerts" or other tools to detect updates on such pages automatically.