Reddit reviews Just Add Hormones: An Insider's Guide to the Transsexual Experience

Here's my list so far. It's a mix of FTM-specific, general trans, and gender studies books, including essays, memoir, and more academic works. In no particular order:

Gender Trouble by Judith Butler


Gender Outlaw: On Men, Women and the Rest of Us by Kate Bornstein

Gender Outlaws: The Next Generation by Kate Bornstein and S. Bear Bergman


Nina Here Nor There by Nick Krieger

Female Masculinity by Judith Halberstam

Nobody Passes - Rejecting the Rules of Gender and Conformity edited by Mattilda Bernstein Sycamore


Whipping Girl by Julia Serano


How Sex Changed: A History of Transexuality in the United States by Joanne Meyerowitz

Becoming a Visible Man by Jamison Green

Queer Theory, Gender Theory: An Instant Primer by Riki Wilchins

PoMoSexuals: Challenging Assumptions About Gender and Sexuality edited by Carol Queen

Genderqueer: Voices From Beyond the Sexual Binary edited by Joan Nestle

From the Inside Out: Radical Gender Transformation, FTM and Beyond edited by Morty Diamond

Second Son by Ryan Sallans

Why are Faggots So Afraid of Faggots? by Mattilda Bernstein Sycamore

and the must-read fiction:

Stone Butch Blues by Leslie Feinberg

I'll edit this if I can find any others, I'm probably missing a couple. Been a big non-fiction reading year for me!

EDIT: Edited to add links, and a few more on my wish list I haven't picked up yet.

Letters for my Brothers: Transitional Wisdom in Retrospect edited By Megan M. Rohrer, M.Div. & Zander Keig, M.SW.

That's Revolting!: Queer Strategies for Resisting Assimilation edited by Mattilda Bernstein Sycamore

Transgender Voices: Beyond Women and Men by Lori B. Girshick

Just Add Hormones: An Insider's Guide to the Transsexual Experience by Matt Kailey

The Testosterone Files: My Hormonal and Social Transformation from Female to Male by Max Wolf Valerio

If you like reading more, try the trans teens survival guide tumblr, or GLAAD's comprehensive resources (I linked you to the "trans 101" page, but there's a lot around their site). This sub is also a great place to explore and ask questions. If you have the ability to get a physical book and it's safe to do so/can be hidden from parents, Luna and Parrotfish are good reads for fiction, and Wandering Son is a manga about trans kids. Speaking of parents, The Transgender Child or Just Add Hormones would also be a great resource for them when she's ready to tell them.

Edit: Also, just wanted to add. You seem like an amazing brother and she is lucky to have you. But it is totally normal to be confused or surprised by this stuff too, so even if you don't get things or you say or think the wrong thing sometimes that's okay. And it's always ok to take care of yourself if you need it. The important thing is you love each other.

If you're really interested I suggest two places.

1. /r/socialjustice101
   
   
2. Just Add Hormones By Matt Kailey The book is easy to read and well explained. After I read it, I made both my parents read it and they are now more vered in trasn issues. Furthermore, there is an excellent* glossary of terms in the back of it.

Jamison Green's Becoming a Visible Man and Max Wolf Valerio's The Testosterone Files might be up your alley. Both transitioned later in life and both spent a fair amount of identifying as lesbians before transitioning. You might also find Matt Kailey's Just Add Hormones illuminating, he's a gay trans man who transitioned in his 40's. Also, not a book, but I always personally found that Romeos resonated with me more than anything else and somewhat outside of the typical trans narrative.