You will often begin by selecting a research topic, then defining a research question within this topic to investigate. What's the difference?
A simple topic is too broad. For example:
A research question must also not be too narrow.
As you explore scholarly secondary sources and historical primary sources, you may need to periodically re-evaluate your research question to ensure that it is neither too broad nor too narrow.
Robert C. Williams suggests that a research question might:
Source: Williams, Robert C. The Historian's Toolbox: A Student's Guide to the Theory and Craft of History. Second ed. Armonk, NY: M. E. Sharpe, 2007.
The following books can suggest topic ideas.
Consulting a special encyclopedia in your area of history may also inspire you with ideas for topics and research questions.
Another approach is to start with the primary sources that are available and work backwards to a research question. Browse through sources from the "Primary Sources" tab (or similar). What questions do the documents raise for you? (Maybe regarding the people who created them, the culture in which they were created, etc.) Your research might seek to answer one of your questions.
This list of tips owes credit to: Presnell, Jenny L. The Information-Literate Historian: A Guide to Research for History Students. New York: Oxford University Press, 2007.