bird tricks

I've been teaching my 5-month year-old GCC how to roll. He can't seem to do it by himself... or doesn't know how to. He will only "roll over" on my finger. He spins himself with it, but still (kinda?) uses the ground. I'm not sure how to proceed with it. I don't know how to get him to roll over...

I know this can become a heated and hotly debated topic, so I just want to preface that I’m only on the hunt for information to educate myself and help made an informed decision/opinion free of bias. I request that responses be civil (everyone is entitled to their own opinion and trainer...