Different types of sources will be useful for different things. Furthermore, you'll search for different sources in different ways.
The idea that information changes over time is called the information lifecycle.
Here are a few resources to help you consider what type of source you want, and where you should look for it.
Information Life Cycle Activity Key - This is the completed version of the activity we did in class, for your reference.
Evaluating your sources is an important step in the research process.
The CRAAP test can be a useful for evaluating sources. It asks you to consider a source's Currency, Relevancy, Authority, Accuracy, and Purpose.
These databases (demonstrated during class) can be used to find magazine and newspaper articles.