If nothing else, begin with the Encyclopaedia Britannica, a wonderful but sadly neglected resource.
Read a few books or articles on topics you find of interest.
Why did the Labour Party win the last British general election?
How have conceptions of race changed in the US since the 1960s?
Obviously, you need to have a firm grasp of the facts of the case, but you must then move on to answer a serious and important why or how question in the paper itself.
Real research means something other than reading secondary sources in English or pulling information off the Internet. What counts as a primary source, though, depends on what kind of question you are trying to answer.
Research questions that do not require an argument are just bad questions.
For example, a paper on What happened during the Mexican revolution?
Why does a specific aspect of politics work as it does?
How has a social or political phenomenon changed from one period to another? Why have some countries been more successful in the transition from Communism than others?