Congrats on getting more plots!

As far as I know, production starts as soon as worker cards are staked and the working option is selected. So, there isn't a 24 delay. There is a 3-day delay when unstaked, that's right, which means we have to be careful where we stake what.

As for land surfing, I'm not sure how it'll work since I haven't heard/read the information firsthand, but Bulldog said those with the higher PP cards staked will earn. I assume there will be some sort of bidding option or kicking-out option based on the PP of the cards staked. The owner always earns, regardless of the PP of the cards he stakes, as far as I understood, which eliminates the possibility of someone kicking you out of your own land.