Nice.
What's the lens you've got with it? Is it the "kit lens"? It'll say something like 18-55mm on the front.
6mpixels will be fine for screens and printing anything upto A4 size.
I would suggest, once you've got a hang of it, buy two more lenses; a 50mm "prime" lens for around £100 and then a zoom lens something like a 70-210mm.
And that should keep you going for sometime. Then later, if you find yourself flush, you can upgrade the camera body with something newer whilst keeping the lenses.
Have fun, learn the basics, experiment with the manual settings, but also think about where you're aiming the camera. The camera could be brilliant but if you point it at the wrong thing you can end up with a rubbish shot.
Here's a good list of 10 tips for composing your shot.
http://www.photographymad.com/pages/view/10-top-photography-composition-rulesAlso, look at other people's work (flickr.com is great for that, a lot of us are on there) for inspiration and post your own photos so other people can comment. It's a great way to get feedback and have other people tell you what they like and didn't like in your shot.