1 - Learn HTML, CSS, and Javascript (should take a few months)
2 - Download something from http://www.apachefriends.org/en/xampp.htmlThe windows 51-Mb self-extracting rar archive will be fine for most of you.3 - Install it.4 - Run the Apache control panel, and start 'Apache'.5 - In the xampp folder, find the "htdocs" folder. This is where you will be putting php files.6 - Learn some php.7 - Add a .php file, and put something like "<?php echo 'YESSsss'; ?>" in it. If you saved it as "xampp/htdocs/one.php", then go to "localhost/one.php" in your browser. It should show something!1 - In a php file, php tags are like html tags:<body>
HTML
<?php
echo "PHP";
?>
</body>