So far, you have been introduced to the creation history and to a synopsis of "Aida". Rather than duplicating further efforts, I want to provide you with some excellent links for complimentary information and further exploration and wish you an interesting time with them!
A listing in English of all first performances, contributed by Stephen L. Parker
Listing of librettos written by the libretto writer of the "Aida"
Access Indiana University's Italian language libretto of this opera via this link!
Stanford University's Opera Glass Index provides a link list
to resources available on the web on a great variety of operas
Another excellent Italian language libretto source!