A professional photographer would be an excellent idea. But if you don't think you can afford to do so and want to invest in an appropriate camera and lighting which can be very expensive. B & H photo in New York could probably advise you. Or Adorama. But there is definitely a learning curve to do great photography. It is not as easy as it looks. Different backdrops take different lighting. It also depends on the lighting in the area you will be taking the pictures.

@BeverlyFLADeziner: No, I'm not assuming the back has a finish. If you are referring to the cable being visible, or the approach to route it under the sofa would not work, there are two options: Align the table so that the "backless" back is up against the side of the sofa. So, flip it 90deg compared to the image of a sample sofa and this table posted earlier. The cable can be stuck along the curved edge of the table on the back, so that it is not visible. This way, it gets down to the floor along a surface that people cannot see as opposed to dangling through the hollow portion of the table.

you are thinking about the space right now. it looks odd, no doubt. 1) when you fill in with the furniture, just make sure the three steps are hidden. 2) consider three potted plants of different height, so the rectangle is complete. 3) glass bowl with Siamese fighting fish for each step 4) figurines of different heights 5) 2inch square wooden bar on each step up to the top of the rectangle. and complete the entire rectangle if you want with a smaller rectangle open in the center my suggestion is, there is a reason why this space ended up like this. it will look great once you put something there. things like these are what make your house unique.

you could always use any glass top table with steel frame and put a matt finished steel tray arranged with some metallic miniatures or candle stand or spray paint some wooden table with metallic paint and give an oxidised look.