Figuring Out How to Use a Step Motor

#include <Stepper.h>
const float STEPS_PER_REV = 64;
Stepper steppermotor(STEPS_PER_REV, 8, 10, 9, 11);
const int PotPin = A0;
int PotVal = 0;
int angle = 0;

void setup()
{
  pinMode(PotPin, INPUT);
  Serial.begin(9600);
}

void loop()
{
  PotVal = analogRead(PotPin);
  Serial.println(PotVal);
  angle = map(PotVal, 0,1023,0,359);
  steppermotor.step(angle*5);
}