For example - If we have 3 nodes. Each node takes turns writing, but the oder of who goes when is random.
3 - 2 - 1 . . . 1 - 3 - 2 . . . 2 -1 -3 . . . exc
This is exactly how the whole thing works. Slot leaders are selected at random.
P.S. Please try not to create multiple consecutive messages on the same thread and put your whole idea in one comment. You can edit your comments for that matter.
I have miss the registration for stake pool, because it was closed on 31-MAY-2018, any idea in future Cardano will open again these registration or any possibility now for delegate ADA?
That registration was just for the testnet, information on registration and/or other requirements for mainnet stake pools will become available later.