CompletePlanet - published a white paper on the scope of the deep Web. Use Boolean logic or Search Engine Math to construct search statements. This is better than being a novice with many.
Every search engine has a basic and an advanced search screen.
Use both to refine your search. Often the Advanced screen is easier to use. Bookmark to organize and save your sites into folders. Truncate the URL from right to left to determine the source of the information and find other relevant sites. The world of the Internet and the World Wide Web is a volatile one.