Why were there men pharaoh's?

The first Pharoah was not created, he was a tough man - a great fighter - who conquered lands and set his own self up to rule them. "Pharoah" is just a name for what existed even before the name was applied to the man.

All the later Pharoahs were expected by their people to be tough fighting men, and had to lead the army into battle and win before anyone would obey them.