See the phpinfo() page on Drupal.org to learn how to use phpinfo to get the details of your system. For example, phpinfo will tell you if you have a database already installed and what versions of PHP, MySQL, etc. your system is running. Phpinfo will also tell you what PHP variables are set as well as many other helpful things.

What would be a best way to launch a simple Drupal web site on AWS?
I've just started learning AWS. So far, from what I have learned, I can go either of the following ways.
1. Create an EC2 instance, install xampp and drupal, and keep developing web pages and web apps in EC2.
I've done this, but I have not figured out how to make the web site accessible. (Do I need to setup elastic IP?)

For information on managing the ongoing operation of a Drupal site, see the Administration Guide. For information on developing the basic information architecture using menus, taxonomies, blocks etc, see the Structure Guide.