It’s been a while, but as I recall you are supposed to go to the beat of Staying Alive (or Another One Bites the Dust if you’re morbid). Is that still true?.
Decent training video on hands only cpr
AHA hands only 2 min video
Full AHA BLS certification
Call 911! Let the chest rebound, use your core not arms to push, 100-120 compressions a minute. Use other people if available, you will get Tired quicker than you would expect. You end up looking like you played pickup basketball after 5 minutes of CPR. Hard and Fast until help arrives.