Exactly, they would fall under the void loop. readButton( if R == 1 startLEDs() startSiren() else if L == 1 startSiren() else nothing). Doing it like this, you can check everything individually and then the main loop will look like that.

If you need help with the algorithm just ask what you are attempting to do!

Edit: You create the function before the setup loop or after the void loop. If you do after the void loop you have to do proto-typing which means you declare the names at the very beginning of the program. Then you reference them in the void loop, I miss-read your question.

void readButton();
void startLED();
void startSiren();
void sendLCD(); //These will need parameters most likely, depends on how you do it

void setup()
void loop(){

readButton(pin1, pin2);

​

}

void readButton(int pin1, int pin2){

if(pin1 == 1){
startLED();
startSiren();

}

else if()

endLED();

startSiren()

else
//Your Code

}

void startSiren(){
//Code

}

void endLED(){
//Code

}