Below you will find a list of the books that I mentioned earlier. Please take a look and equip yourself for the future conversations you'll have with your students on a wide variety of issues such as homosexuality, evolution, abortion, and the problem with evil and suffering. I know these will be a great resource for you.
The Case for a Creator by Lee Strobel
The Case for Faith by Lee Strobel
Tactics by Greg Koukl
Darwin's Black Box by Michael J. Behe
Darwin on Trial by Philip Johnson
Apologetics for a New Generation by Sean McDowell
Understanding Homosexuality by Alan Shlemon
Islam by Alan Shlemon
Mormonism by Brett Kunkle
The Reason for God by Timothy Keller
More than a Carpenter by Josh McDowell
I hope you find these resources to be invaluable!