I need to create a PHP page that will be styled like one of our HTML page (please see www.bigmusicgeek.com/contact.html for an example). Based on the code of the HTML page, what will I need to add the the PHP page for the theme to 'transfer'?
There is no real difference between an HTML page and a PHP one. PHP is a server-side language that processes the dynamic code on the server, and sends only the HTML output to the browser. You style the HTML elements of the PHP page in exactly the same way as in a static HTML page.