Read, read, read.
Birthing from Within is a good book to look at. I didn't go for all of the birth art stuff, myself, but it brings up a lot of good things to think about.
Birth stories are a great preparation, I think.
I found a book at the library, Story of a Modern Midwife, or something like that. Good read with lots of birth stories.
A Midwife's Story, excellent book. (I especially liked it because it is about Lancaster, PA, where I grew up.)
The new Ina May Gaskin is supposed to be quite good, also with lots of birth stories. I haven't read it yet.
And of course, there is the wonderful internet.
Seeing that you are in Brooklyn, I took classes at Elizabeth Seton last time (which of course is closing
), but won't be taking them again this time around. I found that they were particularly helpful for me and DH to do together, but I had done so much reading that I personally didn't get a lot of new info. You can really inform yourself quite well if you want without a class.