If you are prepared to buy a book Roy Osherove's book 'The Art of Unit Testing' is a great read when starting out with TDD. Roy also has a blog here. Uncle Bob has some great blog posts here.
A colleague of mine has some very clear concise blog articles on TDD here.
If you don't know what a code kata is have a look at at the kata catalogue at http://codingdojo.org/. Code kata's are a great way to practice TDD.
I have written a blog post on solving the FizzBuzz kata, it's a very simple kata, but in my post my aim is to demonstrate how to go about doing TDD test first. You can see the blog post here.
There are also some great TDD videos up on PluralSight although you would need to pay for these.
Learning to do TDD is a journey and can be pretty frustrating to get right to start with, but if you do get it right the rewards are massive so I would suggest giving it a real go.