I need help with a confetti balloon.

I've always wanted a confetti balloon that will rise for 20 seconds then spray colorful particles then make the object die. I've made the balloon but i need help with the script. Anyone got any ideas?
P.S. i have gotten this far.
default
{
on_rez()
{
llSetForce(<0,0,10> * llGetMass();
llSetTimer(20.0);
}
timer()
{
llDie();
}
}

Cool idea! Most of what you want involves particles. Visit the Particle Laboratory at http://slurl.com/secondlife/teal/180/74/21/ to learn everything you will need to know for this project (including sample scripts and snippets) and more.

I know that but I don't know where to put it in the a script.

In the timer event, above llDie().
Until you get it working, you might want to throw an llSleep in there also like this:

timer(){
//Do particle stuff here
llSleep(1.0);//adjust as necessary
llDie();
}

Also, make a confetti texture to use with the particles so it looks like confetti and not particles.

Also, I've found it helpful to place the particle engine/system in a function, so you can call it from your code by simply calling the function, rather than putting all that into the script proper. Not sure how this helps or doesn't help performance, I just know it makes it easier for me to write and, later, read lol.