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Saying Kiddush Levana with a Minyan:
It is permitted to say Kiddush Levana in private. Nevertheless initially one is to strive to say it together with a Minyan, as the King is more beautified when his commands are performed in a public forum. Likewise saying it with a Minyan allows Kaddish to be recited after the conclusion of Kiddush Levana.
Should one delay saying Kiddush Levana until he has a Minyan available?
Other Poskim however rule if one has a group of three, it is better to say Kiddush Levana at that time rather than delay it until a Minyan is available on a later night, even if the Minyan will be available prior to the 11th.
 Peri Chadash 426 brought in Kaf Hachaim 426/13; Biur Halacha 426 “Ela”
 Lit. “Berov Am, Hadras Melech”; Kaf Hachaim ibid; Biur Halacha ibid
 Kaf Hachaim ibid
 Chayeh Adam 68; Kaf Hachaim ibid; Biur Halacha ibid
 As a group of three people is considered partially similar to a public forum, as is the law by Halel that if it could not be said with a Minyan it is to be said with three people. [Rama 422/2]
 Ashel Avraham Butchacher 426/2
 As is the law regarding delaying Kiddush Levana until Motzei Shabbos
 426 Biur Halacha “Ela”
 As three people is also considered a public forum, as stated above. This especially applies in the winter rainy months. [ibid]
 Kitzur Shulchan Aruch 97/9; Chayeh Adam 118/14 regarding Motzei Shabbos; Kaf Hachaim 426/23
 As the Mitzvah of “Zerizin Makdimim” overrides the Mitzvah of “Bero Am” [ibid]