The APA Style Blog is the official companion to the APA Style Manual. Search for answers to your questions about APA style and if you don't find an answer, email them with your question at StyleExpert@apa.org and they will reply during business hours.
Most databases and Google Scholar have an automatic citation generator for APA, which makes your Works Cited section easier--just check generated citations for errors!
PubMed is a great database, but it doesn't format citations. Copy/paste the title of an article you found in PubMed into Google Scholar to generate an APA citation! Watch this short silent video demo.