Before you start any research, you need to set back and take a deep breath and determine exactly what you want to accomplish and create a plan for doing so. If you approach it is a systematic manner it will make the process much easier and allow for greater success in the long run.
Boolean operators are terms which help you search databases for specific information and assist you in getting what you need in an efficient and timely manner.
AND - combines terms or ideas and narrows your search
OR - expands your options and broadens your search
NOT - limits your search by excluding certain terms or ideas