This comprehensive handout from the library at Angelo State University How To Recognize Peer Reviewed (Refereed) Journals offers useful advice on distinguishing between scholarly and other types of journals.
Among other advice, they recommend also consulting Ulrich's directory.
Many of the databases that you will use come from Ebsco, a provider of online indexes and full text.
These brief tutorials describe the searching strategies that work best in databases such as Education Research Complete. You will need Adobe Flash Player to view them.
Creating a Basic Search (Ebsco)
Advanced Search (Ebsco)