Re: Two questions, splitting a 'queenless' hive.
Two weeks ago I discovered a very strong two story colony of Russians was queenless. Overflowing with bees, but no queen, no brood, no eggs, nada zilch nothing. I got lucky and ordered two Russian queens that arrived 4 days later. I split that hive into two, gave each brood box a queen in the mailing cage. One week later, both queens were released and laying well. So now, I have two hives that are growing.
So it appears you can take a queenless colony and introduce a new queen successfully. Or else I got real lucky.
"If all you have is a hammer, the whole world is a nail." - A.H. Maslow