I have a pewter-type six-arm chandelier that was left in my condo by the previous owner. I want to dress it up by adding chandelier shades, which I have purchased. However, the shades do not or cannot sit on the lights (bulbs) properly. It appears the candle part of the light fixture needes to be lengthened and the light bulb needs to be changed from a rather bulky one to a chandelier bulb.

I want to look up on the Internet just exactly what I need to purchase to be able to use the chandelier shades. Does anyone have a clue what I'm talking about? Thanks!