Use the CRAAP Test
Currency - Is it timely?
Relevance - Useful for your purposes?
Authority - Who? What is the source?
Accuracy - References to back it up?
Purpose - Why? Is there a bias?
More detailed information on the CRAAP Test
Biological Sciences Databases
Interdisciplinary Science Databases
Health Sciences Databases
To determine whether a journal is peer reviewed, search for it in Ulrich's Periodicals Directory and look for the little referee symbol: 
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University of Alberta Libraries - University of Alberta, Edmonton, AB, Canada T6G 2R3 - We are located on Treaty 6 / Métis Territory.
