Where to start

Basically i've learnt HTML. And I was wondering where to go from here, I am aware it is possible implement other type of code into HTML and that HTML is just the building blocks of a good website.

English would be a safe choice.

javascript and php/mysql are also fine choices.

XHTML/CSS and of course PHP

JavaScript for neat effects
PHP for dynamics

Well I guess the big question is what do you want to do with knowledge?

If you want to do web work professionally then Javascript, PHP and or ASP, .NET or Cold Fusion would be a good start. You might also later want to look into getting a handle on a JS framework like jQuery or MooTools. Then you can go after MySQL and AJAX. There are a ton of great tutorials on all of that stuff but just don't yourself out trying to learn it all at once.