The databases are not in an order of importance since each patron has different research needs.
Take a moment to think about your topic.
Define your topic by asking yourself a set of questions.
Turn your topic into a research question (a thesis topic).
Think of words and phrases to use in a search of information regarding your topic.
If nothing works, change your search terms to find more specific or more general information.
Remember you can always ask for research help from a librarian.