In my view too many lenses is a disadvantage while you are 'finding your feet' - the standard sort of kit zoom I assume you got with your camera provides reasonable image quality, flexibility, and there is no need (until you want something longer) to be changing lenses in the field.
My advice is to get out, take pictures, and look at them back home on the PC very carefully. Ask yourself what is in the image that is good, what shouldn't be in it, what is distracting, and so on. In short start developing your 'seeing' eye - what's the point in the sharpest image in the world if it's uninteresting or positively boring?
You are in the UK so Open University courses are available at a reasonable price. Look into T189 - it's last presentation is coming up but it will both start developing your eye for an image and teach you the basic technicalities. You also get a copy of Elements with it, and being a student opens the door to big discounts on Photoshop, Office, Windows and (I suspect) other software. My last OU course cost me £120, and I saved about £300 on Photoshop CS4.

Like most OU courses it was also interesting!
Another thing to consider is joining a Camera Club. The PAGB is the umbrella organisations for camera clubs in the UK and their website will help you find a club near where you live - probably several - visit them and see what feels right for you as they vary hugely in size and 'feel'.
Member Federations
There is also the Flickr Photography Critique group which unlike most Flickr groups has a lot to offer if you want to improve your images:
Flickr: Photography Critique
PS I forgot to mention - make sure your basic screen calibration is OK. It's so frustrating to think your images are too dark, lighten them and wonder why they have blown highlights or vice versa when the problem is the screen.
http://www.photofriday.com/calibrate.php
Google will find lots more sites discussing monitor calibration.