will help you run PHP scripts from the command line.
Then, find out where your Apache DocumentRoot is. Do this by either doing:
$ sudo updatedb
$ sudo locate httpd.conf
Then open httpd.conf from the location you just found in your favourite text editor, and scroll down to the "DocumentRoot" line - that will tell you where you can put all your website's files. Note: you may need to add the filename 'index.php' to a line in the httpd.conf alongside 'index.html' and possibly some others - you'll know when you find it.
I advise you to buy yourself a good book about PHP and MySQL on Linux, as you do not seem to know how to use them. 'locate apachectl' and then running '/path/to/apachectl start' will start the Apache server, use the 'mysql' command to run and configure MySQL, and use the PHP command to run scripts from the CLI.
There should already be an Apache PHP module installed - if not, read up on how to add it on the [uirl=http://php.net]PHP[/url] website.
If this seems a bit daunting, remove PHP, MySQL and Apache and install XAMPP
- that'll do it all for you