They'll change things for the sake of change, put down your old, trusted employees and try to make heroes of themselves at your expense. Never make an organizational chart. The last one I made was 16 years ago and everyone had their nose bent out of shape for six months. You can't represent human interaction in such a simple-minded way. Don't allow meetings.
Meetings are the curse of American business.
Communicate and decide things in the hall, parking lot or over lunch. That way, no one shows off or gets bent out of shape if they weren't there. Have a love affair with your employees. I mean all of them. Trust them, embrace them, tell them all your secrets and treat them like one of the family.