These are resources which will provide information over current and past issues and events which shape policy arguments and decisions. The news resources are likely to provide financial information too.
Public policy is a set of actions (or lack thereof) by governmental organizations regarding a particular issue or problem affecting the society governed. You will argue for actions to be taken on a topic of your choice.
Search for journal articles on most topics. This multi-disciplinary database is a good place to start if you don't know where else to begin. (EBSCO)