More than 1.6m in super. I am confused about the rules which apply when I retire next year.

I am fortunate to have a healthy sum in my super. When I turn 60 next year, should 1.6m of my total super will go into pension phase or should it be less to take into account the increase in value from the investment earnings even though money will be withdrawn? I understand that any amount in pension phase that takes my account over 1.6 will be taxed highly. And what happens to the left over money in accumulation? Am I allowed to access it? What rules govern this money? You can see why I am a bit confused. Finally, is there a good resource I can read to learn more about it? Look forward to replies and thanks in anticipation.