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Here's my sketch, but I have no coding skills.

include

const int stepsPerRevolution = 2048; // change this to fit the number of steps per revolution
// for your motor

// initialize the stepper library on pins 8 through 11:
Stepper myStepper(stepsPerRevolution, 8, 10, 9, 11);

void setup() {
// set the speed at 60 rpm:
myStepper.setSpeed(15);
// initialize the serial port:
Serial.begin(9600);
}

void loop() {

// step one revolution in the other direction:
Serial.println("counterclockwise");
myStepper.step(-4000);
delay(50);

// step one revolution in one direction:
Serial.println("clockwise");
myStepper.step(4000);
delay(50);

}