Help with making a stepper motor start with a button

Hi everyone,
I am having trouble coding a stepper motor to start with a button. All I want to happen is for the stepper motor to begin rotating around when a button is pressed and for it to continue rotating even when pressure is released from the button. Below is the coding I have done so far but I’m not sure if it is right or where to go from here as it isn’t working.

Any help would be much appreciated!

CODE:

const int buttonPin = 7; // the pin number for the button

const int buttonInterval = 300; // number of millisecs between button readings
unsigned long previousButtonMillis = 0; // time when button press last checked

#include <Stepper.h>

const int stepsPerMotorRevolution = 32;
const int stepsPerOutputRevolution = 1; // change this to fit the number of steps per revolution of motor

Stepper Stepper1(stepsPerMotorRevolution, 8, 9, 10, 12); //Initialise your stepper motor on pins 8-11

unsigned long previousMillis = 0; // will store last time LED was updated
unsigned long currentMillis = 0;
const long stepinterval = 10;

void setup() {
// put your setup code here, to run once:

pinMode(buttonPin, INPUT_PULLUP);
}

void loop() {
// put your main code here, to run repeatedly:
readButton();

currentMillis = millis();

}

void readButton() {

if (millis() - previousButtonMillis >= buttonInterval) {

if (digitalRead(buttonPin) == LOW) {

previousMillis += stepinterval;
Stepper1.setSpeed(300); //sets the speed of the motor in rpm
Stepper1.step(stepsPerOutputRevolution);

}
}
}

Use code tags next time. You don't get a lot of warnings for violating this forum rule.

You have a function called readButton(). That does a lot more than reading a button. It is best if the name of a function matches what it actually does. Take that stepper code out of there and put it in its own function.

Then those two functions need a way of communicating. Maybe a global boolean variable called stepperShouldRun. That can be set to true or false by the button function and the stepping function can use that to decide if it should make a step.

[code]
your
   code
     here
[/code]

What do you want the code to do exactly after it starts turning? Spin forever? Spin a certain time? Certain steps? What should happen if the button is pressed again?