Colin, I wouldn't jump into thinking about replacing the kit lens straight away, you've only had the camera a day. Its more than a capable performer.
You've already confessed "I have no idea what anything does", so my advice would be to ditch automatic modes, stick with the kit lens and read, practice, read, practice etc. Once you've nailed the concepts of aperture, shutter speed and ISO and how they interact with each other you'll be taking good shots and you might be in a better position to know what lens you need and where your photography is taking you.
Until then, don't get drawn into "my lens isn't good enough". Trust me, I was there too at the start thinking it was the lens. LOL. It wasn't!
As someone else said, "Understanding Exposure" is £13 well spent to get to grips with concepts:
http://www.amazon.co.uk/Understandi...-Photographs/dp/0817439390/ref=dp_ob_title_bk