Gurnk, the poll will only allow you to vote for one person out of the names mentioned. I guess it'll make you think about who you'd like to join the staff the most.
If you really want to vote for more than one person then comments in this thread could go some way to getting an idea - though only mention those names in the poll (else the nominations earlier would be pointless).
As for the number of people that will be joining the staff, that's not decided yet but probably more than one and less than fourteen.