What is the Process if you are Laining Meggilah for women only: Who makes the Bracha? Before and after? Can a person who has already heard be yotzeh the Women? Does it make a difference if it is Multiple women or one?
See: “Women’s Megillah Reading,” Aryeh A. Frimer, In “Traditions and Celebrations for the Bat Mitzvah,” Ora Wiskind Elper, Editor; Urim Publications: Jerusalem, 2003; pp. 281-304. PDF file available online at: http://mj.bu.edu/rsrc/MailJewish/MjReaderContributions/WomensMegillaReadingRev3.doc; HTML files available at http://www.lookstein.org/articles/women_megilla_reading.htm and http://www.daat.ac.il/daat/english/tfila/frimer2.htm.
Per the Magain Avrohom 585:3 if the one reading the Megila has already heard the Megila and fulfilled the mitzvah, it is advisable that those listening should say the Bracha "Lishmoah Megila" themselves rather than have the reader say the blessing.
To supplement, not supplant, R'Gershon Gold's answer, no one says a b'racha after a reading for women. (Source: Rama 692:1, q.v.)