Beginner Facebook Application Questions

I'm just getting into Facebook application development. I've got some questions about how the applications are developed.

First, there's the Facebook PHP SDK. You can install this to a web server capable of executing PHP, but does that mean if you we开发者_运维问答nt to www.example.com/facebook-php-sdk/examples/example.php that it would look like you're on Facebook.com but with your fully functioning application?

Second, when I configured apache to set the documentroot to /facebook-php-sdk/ I got white screens with every file - even with proper application ID and secret filled in.

Third, how do you set up to develop locally? I would like to have a sandbox where I can mess around, but the instructions are vague about how to get the PHP SDK going, I'm not sure what files I can edit where to get my "Hello, world!" on.

Thank you all for the help! I am very excited to start developing Facebook applications.

There's a tutorial here, a webcast here and a slide presentation here.
All for beginners.

Kindly check error logs of Apache in "/var/log/apache2/error.log" if you are on Linux. I also was getting blank page, but on error log I saw that I needed the cURL library to be installed.