I need to purchase a digital camera but no very little about them, can anyone advise me? I will be taking shots of stained glass from inside.

Hi
As you probably realise, you've set yourself a hard task there. I've never tried it but I imagine that shooting stained glass windows is best suited to long exposures - at least a second or two. Unless there's a LOT of light coming in, shooting at 1/60th or above simply won't capture much.
The problem is that digital cameras aren't geared towards this kind of photography. They anticipate shutter speeds of 1/1000th/sec etc. Mostly they're geared towards point and click, unless you spend upwards of £1000-£2000 on a piece of professional equipment.
I think I'm right in saying (ie I'm prepared to be corrected) that the chips used in digital cameras to capture the image can't handle long exposures anyway - there's some colour shift, I think, and the image starts to break down. I've certainly never seen a digital camera offer manual control over shutter speeds above one second (and possibly not even that - I can't remember).
The best policy might be to use a standard film camera, take your picture using transparency (ie slide) film, and then buy a separate slide scanner. This also allows you to use special film which will do a better job with the colours (ie FujiFilm Velvia - if it's still available). Only the poshest digital cameras are able to emulate particular film colour responses.
Hope this helps.