Practices from my neck of the woods regarding candle magick
Some people do not use matches to light candles, the sulfur is considered unclean.
If you feel this way, use an incense starter or stick to light your candles.
To extinguish a candle, snuff it out or wave your hand over it hard enough to make a breeze to put it out.
Do not blow it out. Blowing a candle out blows desires away.
Most traditions believe pinching a candle out is fine. In my tradition that is not the case, even though I mentioned pinching a candle out earlier, we believe pinching a flame pinches out desires. The view of pinching a candle out or not, varies from Tradition to Tradition. Follow your own beliefs and practices, I am just sharing mine.