Well, here is about what you need to do:
1) Learn PHP/MySQL http://www.tizag.com/phpT/index.php http://www.tizag.com/mysqlTutorial/
2) Learn PHP Sessions http://www.tizag.com/phpT/phpsessions.php
3) Create an admin login page that will allow access to these forms. http://www.tizag.com/phpT/postget.php
4) Create the form pages and save all changes in a database.
5) Program your website to get the information from the database and display the content. (Using PHP)
That is the super quick run down of what you need to do. As for the actual code, make sure you have at least taken a look at PHP first, so that you can understand any code someone gives you here.
http://www.php.net
"The generation of random numbers is too important to be left to chance."