Do not set the mass to 0. That would make it a fixed entity. Mass is mass, which is not weight, so set mass to your approximated value. Make sure you set friction and gravity to zero though. Since there will be no global gravity and no air friction.

Use the force+torque options to carefully rotate the ship. If you want it to be more arcade like then either A) Don't use physics B) Add a somewhat complex controlling system that adds and subtracts torque and velocity as necessary to balance the ship.