[Sean_Hayes]

I agree with what most other people have said here about doing it in your spare time and then going in full time when you know what you're doing. Give full time effort when the business requires your full time effort, there's no point in doing it full time when you have no users and no application to support.

Books I recommend: Rework, Lucky or Smart, The Art of the Start

Languages: HTML, CSS, and Javascript are a must (jQuery is a great JS library to use). I recommend Python and Django for the server side, though what ever language you choose you should use an MVC framework (Django, Rails, CakePHP).