You have roughly decided on the topic for your project but need a clearer idea. So first of all you go to the school library. Here you will find all the information you need to familiarize yourself with your topic: dictionaries and encyclopaedias. For instance, you might want to write something about the history of pop music. In the encyclopaedia you will find terms like rock and roll, beat music, folk, blues, funk, etc. Based on this information you will be better able to define your topic, to collect synonyms and related terms, and to decide if you want to limit yourself to a certain period or country. These synonyms and related terms are the keywords you will be using in your search for information. In doing so, you will get a clearer picture of your topic. Moreover you will be in a better position to prove the usefulness and reliability of newly found information. If your topic covers current affairs it would be sensible to start searching for information in recent sources like articles in newspapers and journals.