magnetic properties and magnetic flux?

Sir,magnetic flux means the number of magnetic lines of force emerging from magnet I studied that mmf is cause for producing flux in a magnetic circuit.MMf=NI,if two magnets facing each other there exists flux eventhough there is no mmf because mmf=No.of turns*current.since we don't give supply the two magnets ,it repel or attract each other..how mmf is needed or not?.give reply sir