I am really confused about how the shift will occur from PoW to PoS for Etherium.
How will it effect Miners and how will it effect people who have ether?
I am also concerned about the integrity of the entire thing.
As far as I know ETH's shift from PoW to PoS will take place by means of a "difficulty bomb". That is, miners will be driven off their blockchain by increasing mining difficulty beyond profitability once ETH's PoS scheme is ready. I'm not really up-to-date though, so their plans may already look different by now.