I think that w3schools offers a pretty easy tutorial for this. It's completely free, you can do it at your own pace, it's easy, and you don't even have to sign up to their website to learn. Here's a link you may find helpful: http://funadvice.com/r/14item1487p
To start, be sure to read through everything. Even if it's basic stuff, you'll need to know it. Each time you're done a section, click on "Next Chapter".
I agree they have some very good guides.
I don't remember if they tell you what you need to get started, but installing the Java Developer Kit http://funadvice.com/r/bdt6qadsi5j and then getting a development program like Eclipse http://funadvice.com/r/bdt6qadtfdq really helps.
like the computer program ... ? i believe you have to download it off some website online...