Well.... a couple of weeks on and a few hundred shots later... progress.
I have followed lots of the advice you have all given me - thanks so much - and found the following has worked very well:
Lens - the cheap 50mm f1.4 lens is outstanding. Also the Tokina 70-210 gives very good results as does the 70-300 Canon.
Autofocus - if you have to use autofocus set the camera to the centre spot only. If using manual I discovered that the focus indicator comes on even when manually focussing and the image in the centre spot is in focus!
Metering - setting to centre weighted gives much better results than average though it still under-exposes by 1 to 1 1/2 stops.
JPEG vs. Raw - being honest at this stage I see little difference for printed images to 8x10 and for web pages although Raw does have the edge - just!
Software - I hate the Canon supplied software! Breezebrowser is much better and more practical.
All in all and thanks to all your help - I have decided to persevere and keep the camera as the results are definitely worthwhile.
Thanks.

