I've Jumped off the Deep End of Audiobooks and Feel Like I'm Drowning

After hemming and hawing, I’ve taken the first plunge into audiobooks. My publisher will begin to offer audiobooks within the next six months or so, but I decided to start with Rimrider, my self-published YA space opera series, to test the waters and get a feel for the process. I read all the articles I can, but still have no clue what I’m doing. I suspect they were written by people much smarter than me.
I chose ACX since it’s owned by Amazon and is the big dog on campus for audiobooks. They brag on the website that the process is painless. That’s not exactly true, especially for dummies like me who, as I said, haven’t a clue. The pages are set up weird and it’s hard to find specific information. After creating the account and claiming the audio rights for Rimrider, I wrote a short audition script. One section of the ACX website says it should be 1 or 2 pages; another says 2 or 3. I did 2-1/2 and hoped no one got mad. I used different passages in the book to get a feel for the actor’s emotional range. I didn’t find any way on the site to set a time limit to hold an audition. I decided to worry about it later and posted the call.
The producer (in this case, me) can put numerous qualifiers on the audition reading, such as tone, range, or emotion (you can ask for flirty, sheepish, and what the hell is a hip voice?)  My book has characters of different ages and scenes that require a range of emotion, so I only put that I wanted a female voice because it’s a teenage girl’s story. I listed the genre as science fiction/fantasy and posted payment information. I also added more details about the book, characters, (ACX adds your Amazon book description) and what I want for overall tone. My audition pages include a pronunciation guide for the characters and several short phrases that occur in Spanish so I know they’re said correctly. I have no idea how to set qualifiers to find the right narrator, but simply throwing my book up there and crossing my fingers the right person will magically appear seems like a terrible idea. I feel like I’m doing everything wrong.

What are my biggest fears right now?
No narrator will want to do my book.
Narrators will want my book, but no one’s voice will be right to bring the story to life.

I’m doing everything wrong.

I'll post updates as I continue my quest to create a audiobook.