Marco Puatasso, in Ten Simple Rules for Writing a Literature Review, sets out some practical guidelines for the lit review. These are the rules (see the entire article for the expansions on them):
I would add an 11th rule: Do not forget what the literature review is not -- it is not a place to argue your position or present evidence for your conclusion.
Pautasso, M. (2013, July). Ten Simple Rules for Writing a Literature Review. PLoS Computational Biology. pp. 1-4. doi:10.1371/journal.pcbi.1003149.
A literature review is, simply, an objective overview of the relevant research on a particular topic. It provides context for your research, anchoring it within the discipline. It is not meant to be an exhaustive overview, but it should cover the significant research in your field of study.
It is important to keep track of what you read for your research. A citation manager such as Mendeley can help you organize your research.
An in-depth treatment of writing the lit review is Get LIt: the Literature Review from Texas A & M's University Writing Center.
Here are some resources to help you write your literature review: