I'm not an expert but have a couple of tips.
The one thing I did that most improved my photos was getting a light tent.
Info on the one I got can be found in a review I did on Lumberjocks.
http://lumberjocks.com/reviews/1599The light tent diffuses the light which helps, and reduces glare on shiny surfaces. I got a 12" one, and really should have gotten the larger size, my jewelry fits great but the rest of the stuff I do not so much. Light tents can be made cheaply also, Google "light tent" "light box" or "photo tent". I needed one that could be put away easily so I bought mine.
I find that an adjustable desk lamp is a great light source for the photography I do. Cheap and easy to move.
A tri-pod will help stabilize the camera and keep the images clear. This is really important when shooting without a flash as the camera needs more light to get the image. I almost always shoot projects with out the flash.
The background is really important. No matter how good your camera skills are, if you have a dirty shop in the background it will be noticeable. Some of this can be cropped out with software, but I try to compose a good photo from the start. Sheets or table cloths work well, drape the fabric so you don't have a clear line from horizontal to vertical (fewer shadows). If my photo background is black, the picture was taken in my desk chair.
I might think of more tips, I'll post them later.
MrsN