You use a pull-up resistor to connect the Gate to +14.4V and use an NPN transistor to connect the Gate to Ground. When the transistor is OFF the pull-up resistor makes sure the MOSFET is fully ON. Use a 200+Ohm resistor between the Arduino pin and transistor Base to limit Base current.
You will find that the sense of PWM is inverted: 255 is OFF and 0 is FULL ON.