The simplest thing from a programming perspective is to create an include file that defines all your news items in an array and then output it with a loop. You and your band mates could edit a file like this:
<?php
// this array defines the news
$news = array(
0 => array("title", "url", "news text"),
1 => array("Man Bites Dog", "http://k9news.com", "Today in Philadelphia a man bit a dog. Now isn't that crazy?"),
2 => array("Man Also Bites Cat", "http://feilinenews.com", "The man previously alleged to have bitten a dog in Philadelphia has now allegedly bitten a cat as well. Surely this world is getting out of hand?")
);
?>
Such an array can be displayed in a variety of contexts.
However, my experience has been that bandmates are morons when it comes to programming stuff and cannot be trusted to avoid syntax errors so it sounds like you'll need to set up a form to enter news, a page to list all the news (which has links to 'archive' stuff) and also some way to extract the news on your website.
Sadly, this is going to require several scripts and probably a database.
Try googling maybe?
http://www.google.com/search?hl=en&q=PHP+News+script&btnG=Google+Search