All the candles including the extra one are lit at the same time. there are different customs:
Some light at sundown.
Some light about 20-25 minutes later.
Some light after the evening prayer services.
a candle
A Hanukkah menorah, also known as a Hanukiah, has nine branches instead of the usual seven branches of a traditional menorah. The extra socket is for the Shamash, which is the servant candle used to kindle the other candles. Each night of Hanukkah, one additional candle is lit, so the Shamash is used to light the other candles without diminishing their importance.
no, the menorah is lit after sundown or later. We light it in the late afternoon only on Friday.
The shamash (helper or attendant) is used to light the Hanukkah menorah or hanukiyah.
Chanukah candles should be lit after dusk, approximately 25 minutes after sundown. This is the considered best time to light. If one is unable to light around this time or slightly after, it is permissible to light the candles and say the blessings, during the entire evening.
It is called the Shamash. It is used to light all of the other candles on the Menorah or Chanukiah.
If you light the yahrzeit candle before it's time to light the Hanukkah-menorah, you may light the yahrzeit candle first. Otherwise, once it's past sunset, you should wait until about 20 minutes after sunset, light the Hanukkah-menorah, and afterwards light the yahrzeit candle.
Anyone who is able to light a candle. It's not recommended for children under 5.
The Menorah in the Jewish Temple had seven (including the one in the middle) branches (Exodus ch.25). Hanukkah-menorahs have eight branches, plus an extra candle used to light the others.
In Hebrew it is called the Shamash. It is used to light all of the other candles in the Hanukkah Menorah or Hanukiah.
The candle used to light the other candles on the menorah or chanukiah is called the shamash.
Any candle is acceptable. Some prefer tapers made of beeswax.