Hi, Adriel -
I'd suggest you get a copy of the Foursquare Hymnal. Copies are available at a reasonable price from used book sellers. I use www.bookfinder.com

The Wikipedia article on the International Church of the Foursquare Gospel is very interesting. The Foursquare Church Website is also very interesting, and it has special information about Aimee Semple McPherson available right now, and a great video.

There's a lot of video footage of Sister Aimee available on YouTube.

-Joe-
(e-mail sent)