Definitely get into HTML, CSS (duh), PHP and Javascript, and then take a look at AJAX, jQuery etc. Once you pick up one programming language (PHP for arguments sake), it is quite easy to pick up another (Objective C as in iOS apps) as most of the core concepts are the same, although with different syntax.
I personally recommend W3Schools for HTML/CSS reference, whereas I learnt basic PHP at Tizag.com. I also recommend you make full use of somewhere like StackOverflow where you can get answers to your questions within minutes. You may also wish to look at web design blogs etc. (SmashingMagazine is a good one) to expand your horizons.
Sam W from [url=”https://youtube.com/technologetic”]Technologetic[/url]