.htaccess用于手持移动文件版本重定向

I am using Godaddy with the cheapest Linux hosting package and no extra or special configurations. I need help with a complete .htaccess to redirect pages in folders for a single extra mobile version of site pages. It's very basic.

I have a second version of the PHP site files for the mobile version in the format of [filename].php to [filename].mobile.php that also includes the index.php and index.mobile.php. I do have a link top and bottom for users to manually go to the mobile or full site version. I am lost on .htaccess files, can someone help me?