Questions about RSS feeds with PHP/MySQL

I’ve found tutorials on how to create XML files for RSS using PHP and MySQL, but they don’t seem to tell exactly how to implement them within an existing site…I have a site with a news page that pulls the links, headlines and descriptions from an existing MYSQL database. I’m interested in implementing an RSS feed for our news, but am unsure what steps to take.

Do I need to redo my PHP so that when the news page is loaded it takes the info from the MySQL query, writes it to an XML file, and then parse that XML file to populate the news page?

Or is there a better way to do this?

Sorry for the basic, and probably dumb, question…but I just can’t see what to do. I’m sure I’m making it harder than it needs to be.