Photographing glass can be hard if you don't want all the reflections in the glass.  Diffused light is a good way.  

Diffused light is filtering the light by using another object.  Another good way is the use of backlight to reduce the reflections. Try different angles, and maybe put the light above the subject.

Also consider using a polarizing filter and a lens hood on your lens.

Take a photo of some glass bottles and work on having no reflections.