Do you have to write a Literature Review Paper, but you're not sure what to do?
Watch this video to get yourself prepared: https://vimeo.com/kinglibrarysjsu/lit-review-paper
PsycINFO is the core database in Psychology, and should be the first one to search.
ScienceDirect and PubMed focus more on the General and Health sciences, but also contain Psychology related research.
scholar.google.com: You will need to setup Google Scholar the first time you use it on your computer.