Arduino Random Number Generator with pushbutton

I'm new to Arduino, trying to make a random number generator with pushbutton.

My questions are:

1.How can I do that,if I press the pushbutton once, then I will get one random number between 0 and 1024. After that, I want to loop from 0 to the random number and then back to 0.

2.How can I debounce the pushbutton

void setup(){

Serial.begin(57600);
pinMode(2,INPUT_PULLUP);
attachInterrupt(0,randomnumber,FALLING);

}

void randomnumber(){

int number=random(0,1024);
for(int x=0;x<=number; x++){
  Serial.println(x);
  delay(1000);

}

for(int y=number;y>=0; y--){
  Serial.println(y);
  delay(1000);

}

} void loop(){

}

Any good suggestion?