You could google the answer to this very easily.
Installing using apt-get
You simply use the following command to install the applications...
sudo apt-get install http php mysql-server
Setting up Apache
You would then place files in the
/var/www/public_html folder (or similar). These files would show up when you browse to the public ipv4 address of the server on port 80.
If you wanted to set up multiple sites, identified by different public ipv4 addresses or hostnames, you would set up VirtualHosts inside your
httpd.conf file, usually located at
/etc/httpd/conf.d/httpd.conf. There should be an example VirtualHost near the end of the config file (Press CTRL+G in Vi to go to the end of the file).
To specify different options for PHP, you would simply edit the configuration file, usually located at
/etc/php.ini or similar... I'm sure you can find it by typing the command:
sudo find / -name php*
Installing and configuring MySQL
Any way, the final step would be to set up mysql. You can do it manually, or you could just run the
/etc/mysql/mysql_secureinstallation script (that may not be the exact location, again, you can use
sudo find / -name <search term> to find the right file.)
and there you have it.
Easy as pie...
Next time use Google. Asking "stupid" questions is bound to get you the reputation of being an annoying person that doesn't do their research.