Before you begin what do you want your research to focus on using the PICO method search strategy:
For sample papers take a look at journal articles published in JAMA which uses the AMA format : https://jamanetwork-com.ezproxy.rit.edu/journals/jama/fullarticle/202260?resultClick=1
For specific AMA formatting questions look through the chapters of the AMA Manual of Style https://ezproxy.rit.edu/login?url=http://www.amamanualofstyle.com
Chapters 2, 3, etc.
PURDUE OWL does not have a sample AMA paper only for APA and others https://owl.purdue.edu/owl/research_and_citation/ama_style/electronic_sources.html