Start with high-confidence christian dating for teens books, then narrow by subgenre or adjacent topics.
Single, Dating, Engaged, Married
Ben Stuart
What Women Wish You Knew About Dating
Stephen W. Simpson PH.
A Guy's Guide to Life
Jason Boyett
Not Yet Married
Marshall Segal
She Deserves Better
Sheila Wray Gregoire, Rebecca Gregoire Lindenbach
For Women Only, Revised and Updated Edition
Shaunti Feldhahn
For Men Only, Revised and Updated Edition
Shaunti Feldhahn, Jeff Feldhahn
The Guy's Guide to Four Battles Every Young Man Must Face
Jonathan McKee
