Pirates thought that having women on board their ship was bad luck. It's why pirate femmes like Mary Read initially lived a life of piracy as men!
Most pirates stole their ships because they couldn't afford them. Once they'd capture a ship, they'd convert it for pirate life by making more room for sailor living quarters and strengthening the decks to hold heavy cannons.
The difference between a pirate and a privateer is that privateers are sanctioned by respective governments and they don't attack ships from their own country. Pirates harass anyone passing by.
A galleon ship was armed to the teeth. It typically carried 74 guns, 36 of which were mounted on either side of the ship. The two guns were mounted aft.