[tmm84]

As for programming language I would say Javascript.

However, web development is more than programming because it requires document structuring (HTML), document styling (CSS) and document dynamics (JS). All three are used to produce websites. JS is the elephant but learning styling and structure will help you a lot (I know many developers who are weak when it comes to CSS).

Most simple stuff can be done from the hard drive on your computer but at some point I would suggest learning how to use a SVN, develop for mobile/tablets, serve from localhost and build javascript. I would also encourage setting up a VM down the road to learn how to deploy your website to a server (as well as learning basic security/ssh/linux cl) so you'll be familiar with the process and not create vulnerabilities because your aren't a back-end guy. I could go on and on but that would be some of the easiest stuff for you to learn.