Is it too early to give a mishmar about Hannukah? Let's see what Tosfos thinks.

(1) How many lamps should one light on Chanukah? It is a commandment that one light be kindled in each and every house whether it be a household with many people or a house with a single person. One who enhances the commandment should light lamps according to the number of people of the house — a lamp for each and every person, whether they are men or women. One who enhances [it] further than this and performs the commandment in the choicest manner lights a lamp for each person on the first night and continues to add one lamp on each and every night.

(2) How is this? See that [if] the people of the household were ten: On the first night, one lights ten lamps; on the second night, twenty; on the third night, thirty; until it comes out that he lights eighty lamps on the eighth night.

(2) How many lights should one kindle? On the first night, he kindles one [light]. From then on he continues to add one each night, until on the last night they are eight. And even if the household members are many, they should not kindle more. Rem"a: And some say that every one of the household members kindles (Maimonides) and such is the widespread custom. And they should take care to each place their lights in a unique place, so that it will be apparent how many lights they are kindling. (Abraham Kara of Prague)

Outside – Due to publicizing the miracle. Not in the public domain, rather in the courtyard, for their houses were open to the courtyard. The danger – That the Persians had a law that on their holiday (literally "calamity") that they would light a candle only in their house of Avodah Zara (idolatry), as we say in Masechet (tractate) Gitin (chapter 2, page 17b)

The case is where there is no courtyard, but rather a house that is close to the public domain. However, if there is a courtyard in front of the house it is a Mitzvah to put it by the entrance into the courtyard (from the public domain).

Proof #1: This is as the Gemara says later (23a) that if a courtyard has two entrances it requires two candles.

Proof #2: The Gemara also says later (23b) that a candleholder that has two wicks can be used for two different people, implying two different houses in the yard. If they would put the candles by the entrances of their houses, it would be at the right for one of them and at the left for the other (even if their doors were close to each other, and it is supposed to be on the left for both). However, if the candle is at the opening of the yard this is more understandable.

(7) It is a commandment to place the Chanukah lamp at the entrance of one's house from the outside within the handbreadth adjacent to [the edge of] the entrance, so that the mezuzah will be to the right and the Chanukah lamp to the left. And if he was living in an attic, he places it in the window that is adjacent to the public domain. One who has placed the Chanukah lamp above twenty ells has not done anything, because it is not recognizable.

We kindle one Hanukkah light from [another] Hanukkah light, and specifically kindling one from another without an intermediary, but kindling one from another through a non-sacred light is prohibited. And some permit even this, unless it is in such a way that there is concern that the non-sacred light will be extinguished before kindling the other Hanukkah light.

Rem"a: And we have adopted the custom to be stringent with the Hanukkah lights not to kindle even from one light to another, for its main mitzvah is only one candle, and the rest are not as much for the mitzvah. Therefore one should not kindle one from another. (Hagahot Maimoniot and Mordechai) And all this is only while they are still alight for the mitzvah, but after the time of the mitzvah has passed, it is permitted to benefit from them, [so] all the more so it is permitted to kindle from them. (Nimukei Yosef Minor Laws)

That is to say, one candle is enough for the entire household.