I second Mere Christianity by Lewis. I’d caution against Rob Bell’s books. He is what would be considered to be outside of mainstream, historical Christianity.
I’d add “Has Science Buried God” by John Lennox, where he argues against Dawkins.
This one’s also pretty interesting and quite entertaining: http://www.collisionmovie.com/
You can find lots of interesting things on youtube by searching “christopher hitchens wilson”
Other Christian debaters of whom you can find good material on youtube or through an internetsearch are Greg Bahnsen and James White