After HTML you try the following:
CSS
Javascript
The above three takes care of client side coding
After this you need to choose server side scripting. This will depend on yoru resources.
ASP
ASP.net more advanced
PHP
ColdFusion
Java
This goes on and on
If you want to interact with the database you will need
SQL Server
MySQL
Oracle
SqlAnywhere 10
Java based databases
again tehre are many, many
Go back and work with CSS and Javascript. try to pick up XML on the way.
