In order to develop a clearly defined research topic, you may need to do some background research. It's also a good way to generate ideas for keywords! Your textbook is a good place to start. Here are some other reliable sources for background information:
1. Develop a clearly-defined research topic
Select topic, Do background research if needed
2. Come up with a search strategy
Identify keywords, Select databases, Refine as needed
3. Find reliable and relevant sources
Choose appropriate source types for your need (journal, newspaper, or other article; book, website, etc.)
4. Critically evaluate the information
Primary vs. secondary, Scholarly vs. lay publication. Is it up-to-date and relevant to your topic?
5. Comply with professional & academic standards
Plagiarizing vs. paraphrasing, Citation styles, Creating bibliographies