HELP ON EDGE LIGHTING ART GLASS PIECE

Side glow type cable is often used for this. A carpenter creates a channel large enough to hold the cable against the glass edge. The channel could be painted white to reflect light back into the glass rather than absorb it. You should do all sides in a complete loop starting and ending at the light source for the most even effect. You might find help with design from the manufacturer. Most have someone on staff. Be careful with the light source selection as many have a fan and some are much noisier than others.