At 5 volts your resistor would need to be a 4 watt resistor you don't need a resistor and most times you don't need a MOSFET And i bet you can find a good one for free. Find a old radio controlled car. And you'll have about 8 of them for free. There used for the h-bridge in the car.
The power transistors in this all came from a broke car I got for free with heat sink it's could handle 3 amps easy I'm using it on 2 motors that stall at a 1 1/2 amps.
