Although you can try searching Google for your topic, you will probably find the following web search engines provide more relevant and accurate results.
There are two sides to evaluating online sources. First is a concrete examination of the site itself. The following checklist will give you clues to the quality of a given website. Next is a critique of the information itself which requires critical thinking on your part. This process will tell you whether or not you can safely cite a particular website in your paper.
Use this .pdf to evaluate your website sources.