I generally just use printer paper as an infinity backdrop, but I did make a teeny lightbox (DIY for the win!) for product photos.
I'm currently in a crime scene photography class so Im learning all the details on aperture and lighting that I never understood. I think my photos get better and better every week. Little does my professor know that Im using my new knowledge for beauty photos! hah
My major tip for any of you is that the light itself is not the important part it is the color that the light gives off that matters. Auto White Balance does not work well! It is best if you have the option to manually set your white balance for each photo session. Don't wait for post-editing filters! You will immediately seen on your screen a dramatic increase in correct coloring.
AWB only works if there is a massive amount of white in the photo to help it gauge how to filter the light correctly. But, cameras in general are set to want to compensate a photo to grey. Grey is the standard! Which is why our white backgrounds always come out dark, etc.
And another tip. I could never get awesome nail photos until I learned what aperture and f/stops were. You want a narrow f/stop (so the highest number on your camera f/8, f/11, f/22 if you have an SLR) to allow the camera to be able to correctly focus every inch of the photo. Now all my nails are properly in focus and you can see details!