How to use codeignitor, i am a new bie for the codeignitor

[eluser]fariad22[/eluser]
I am new to codeignitor but a great wish to use it. I have made this code as my first program of codeignitor:
<?php
class HelloWorld extends Controller {
//intializer function
function HelloWord ()
{
parent:Controller();
}

function index()
{
$data['title'] = "My first application created with Code Ignitor";
$data['message'] = "Hello World!!!";

//load this to view
$this->load->view('helloworld', $data);
}

}
?>
I saved this file in "application/view" folder but i don't know how to keep this code in one file or have to made separate file for html to show data on visitors browser

Welcome for complete lesson... for the begning...