Here you have some interesting links about the opera:
The Magic Flute - Wikipedia, the free encyclopedia

http://www.aria-database.com/translations/magic_flute.txt full libretto german AND english by Lea Frey

http://www.geocities.com/Vienna/Choir/7652/flauta/libreto.htm in spanish

http://web.tin.it/la_fenice/Libcont/flautom/flautom.htm italian (possibly broken down)

http--www.operone.de-opern-zauberfloete.html

Mozart’s Magic Flute

The Origins, Meanings, Rituals, and Values of The Magic Flute

http://www.febeling.de/aegyptenrezeption/seminar0506/startseite.html

http://www.febeling.de/operngeschichte

spiritual psychology about ISIS: http://3kreuze.de/die-schleier-der-isis/

about "Einweihung" (initiation): http://12koerbe.de/phosphoros/wie-3.htm (DE)

Freimaurer-Loge content
http://www.internetloge.de/arst/mozart.htm

Die Schleier der Isis
http://3kreuze.de/die-schleier-der-isis

Osiris:
http://www.osirisnet.net/dieux/osiris/e_osiris.htm

Interesting:
Magic Flute 2: www.papageno-music.com
http://de.wikipedia.org/wiki/Das_Labyrinth

www.Haich.de
Einweihung - Initiation !
the topic of initiation is part of magic flute 1: fire and water MF2: earth and air!
(get the bi-lingual eBook at half price of paperback)