My first photo tip for anyone photographing items for their shop is to use a tripod!
Whether you have a happy snappy point and shoot or a serious bit of heavy DSLR kit there will be a tripod out there for you, the price (and quality) range is vast.
Your pictures will look so much better with a tripod, you'll get the pin sharp images you want and using a longer exposure may mean that you can put of buying that set of expensive lights you keep looking at in the camera shop.
Once you've got your tripod sorted out, get yourself a remote trigger which means that you can trigger the shutter without touching the camera thus totally eliminating the risk of camera shake. If your camera won't take a release I'm sure you'll have a timer for taking bad photos of yourself, just set that up and it's as good as a remoter trigger.
I hope this helps!
to each their own, but i never use a tripod. too restrictive. i just use a little canon p&s camera with a $20 macro lens attachment, set camera to ISO 400, hand held and . . . VIOLA!