I have to use APA – I struggled for a long time with why so much value was placed on a comma or a space. Now I just do as I’m told.
Here is a link to a great guide put out by an Australian university. I hope you find it helpful.

Any chance your library has Endnote or Refworks which allow you to input the information and it will format it for you automatically? I did APA manually for a loooong time and then got to do a couple of papers using Endnote. It was like, “Where have you been all my life?”