News Script php,MySql

News style addition to the website where i can add a news stories to the front page of the site with a highlight , summary and link to the full story, then as another news story is added move the previous news story below the new news story as a highlight and a link to the full story . The place where i would add the news story would be in my admin section. Could you modify an existing blog/news script or would it be easier to write up a new one