Candle work is magical work.

Candles have been used for centuries in ritual and magic practice. Fire of the candle is a powerful tool, it can ignite things, create and also remove and destroy and you can also use fire to invoke things. 

The candle signifies, light, warmth, celebration, love, hope, commemoration. 

There are many many different forms of crystals and it pays to do your research on what might be a good match for you where you are at. Also walking into a crystal store and taking not of what you may feel and energetic pull towards. Sometimes the crystal chooses you.