Question

how do you do a paper using APA style

Answer 1

The American Psychological Association has a tutorial that "shows users how to structure and format their work, recommends ways to reduce bias in language, identifies how to avoid charges of plagiarism, shows how to cite references in text, and provides selected reference examples."

It would be a good resource to get you started: http://www.apastyle.org/learn/tutorials/basics-tutorial.aspx