The following sources will provide you with the basics in using APA format.
APA Formatting and Style Guide from Purdue's Online Writing Lab. Note especially the page on in-text citations to avoid plagiarism.
APA Style Essentials from Douglas Degelman, Ph.D., and Martin Lorenzo Harris, Ph.D., Vanguard University of Southern California. Authors include details about formatting such as spacing, tabs, and a downloadable template for Microsoft Word. They have also linked a sample paper and a sample proposal.
APA Style from the APA includes information about writing without bias and citing electronic resources. Look on the lower part of the page for material on references and in-text citations.