Here's another book I gave to my neighbor future missionary boy. It was really hard to give up. I still have fantasies that maybe they'll still call me on a mission. Like a secret one, where I go undercover as a mom of a toddler.
When Dale deployed for a year and a half, I thought, "Dude! I could have gone on a mission right now." The being pregnant part ruined the plan, though.
I don't think there are any better books than Brother Bott's for learning about being a missionary. I base this not only on my own uninformed non returned missionary opinion, but on the opinions of those who actually went on missions.