There are heaps of news script at
http://www.hotscripts.com/PHP/Scripts_and_Programs/News_Publishing/
The Best thing is to try make ur own script
Install Apache,mysql , php and phpmyadmin on ur system/
1) learn how to connect to database and other basic things of php
2) Read code/tutorial as much as possible and try to understand.There are thousands of notes,tutorial on news system
3)And take a final step to creat ur own news script.
Here are some hints for a simple news script
create table let say news
-news_id
-news_headline
-news_body
-news_date
now insert news in the above fields
Pull news from this table and display it where ever you want to display