I'm secondary but we've just had a new boss and I can tell you a few things not to do! Don't go in and try and change things straight away, get a feel for the place first and figure out what everyone's like and what their strengths and weaknesses are. When you do have to change something make sure everyone is consulted and things are communicated. Nothing worse than being told after the event! Lead by example as a teacher, don't tell your team to do something you can't or won't do yourself. Try and find out a bit about each member of your team and let them know some things about you. Use your team to help you, their expertise in knowing how the school runs will be invaluable.