Now, the new school of thought with CPR is that you don't have to do the rescue breathing, just chest compressions. Start by putting your hands on the victim's chest. Lean over the victim, and press 100 times per minute. If you remember the Bee Gees, you can sing the Stayin' Alive song in your head for the tempo. (I don't know who the Bee Gees are, but mommy likes them.)
You probably want to have someone call 911. Keep pumping and pumping at that pace until the paramedics arrive.
Good work. If you need to borrow my puppies so you can practice, just let me know. I'm good at sharing.