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I will try and help out a bit but don't have time to do a full run down so will cover the basics and show you in a very quickly thrown together setup.
The example I have shown is of a white background and base and black outer reflectors to give a dark edge to the glass, but this can be reversed and you can use a dark background and base and light reflectors to give a light edge to the glass. There's a flash at the back of the table on 1/16 power pointing up at the white background, there's a studio head with softbox about 2 feet infront of the table (placed by the white arrow in the shot below) and it is metered to f8 but if you don't have a meter simply do it by trial and error until your glasses look correctly exposed.
I will say I am not overly happy about the final shot, the stem is discoloured due to my base tile being off white (almost light pink) and that is refracting up the glass, plus I oversharpened the image a bit too, but it's just a quick example which will hopefully help you a bit.
Here's a shot of the setup.
Here's the original just resized.
A little dodging of the tile edge to soften the background a bit and here's the final image.
Hope this is of some use, if you have any questions let me know and I will do my best to answer them for you.