... start with what you know and use that to identify keywords and to clarify concepts. Keep track of all of your research - write it all down.
Information about managing your personal content can be found here. Use these tools to help you organize and cite your references:
Look at databases listed in related subject guides for additional and more specific resources.
Find new journal articles about your research topic!
There are a number of services via email and RSS for accessing tables of contents of new journal issues and research alerts (results of literature searches you construct, run periodically).
This site will provide links to these services, as well as an explanation of what RSS is and how it works.