>What do you do with all of those queens? Do you immediately create new hives or bank them?
It depends on what I need, but having extra queens is always handy. In my case I sell them.
> How do you get a bunch of queens too?
Every nuc that has a frame of cells will end up with a queen. If five frames have queen cells, that's five queens.
> Doesn't the first to hatch go around and kill the others in their cells?
In that nuc, yes.