the content is stored in the database so you’d need to import those tables to get all of the posts and pages content. the images and other media are in the uploads folder of your site which you can download and upload to the new site via ftp.
also make sure that the new site is exactly the same environment as the testing site: same plugins with the same settings, same permalinks structure etc or things will go squiffy.
The content of a WordPress website is NOT in the files, it is all stored in the database.
Suggest that you read this article:
http://codex.ww.wp.xz.cn/Moving_WordPress
It may be that rather than doing this, that you want to redevelop the new site to operate like the old site, this would entail opening the PAGES or POSTS in your present site, and pasting the content into new PAGES / POSTS on the new site.
Thanks for the info. Can you tell me where the database file or files are that I need to copy to the new site?
There’s some good information about backing up and restoring the WordPress database located in the Codex: Backing Up Your Database
Some more information that might be helpful: Moving WordPress