You can also verify no fuel by spraying a bit of starting fluid onto the open air filter while and assistant cranks. Don't use too much or it might backfire on you. Keep you head and eyes well clear
Later: You can tell if the cam is turning by removing the oil fill cap and looking straight down into hole. You will be looking at one of the #3 rocker arms. It should go up and down while someone operates the starter.
Between retepsnikrep plug test and these other tips, you should find something. Let us know how it works out