Material / Texture Questions

I am working on my project and I have come across a few things I need answered.

  1. Why is my glass…only partially glass? I do not know why only half of it looks realistic, the other half is pixely.
  2. I will then need to make each of those spheres into light bulbs and have them emit light (how do I do this)
  3. The border (minus the light bulbs) will be metal. What is the best way to go about doing this part of it? I am nervous now because of how the glass came out.
  4. I actually want to add a liquid inside of the glass, and I am not sure about that one either.