when planning a search on any topic area it is important to be familiar with the tertiary sources (bibliographies of bibliographies), which will help you to identify the secondary sources (such as bibliographies, indexes and abstracts), which will then lead you to the primary sources for your review.
The first thing you should do is formulate a strategy for your search. This presents us with something of a paradox; how can you start to search for literature until you have an idea of your theoretical framework?