If you’re going to engage in defending the faith as instructed by Peter and Jude (1 Peter 3:15, Jude 3), then you’re going to need to be able to communicate effectively. This will involve good listening skills as well as good speaking skills. We are, after all, called to be ambassadors for the Lord Jesus Christ. And ambassadors need to be able to communicate effectively.
Greg Koukl is one of the better Christian communicators that I am aware of. He has one particular book, Tactics, that does a very good job of teaching how to interact with others. And the material he presents is not just for non-believers. The skills that one can learn in this little book will carry over into many areas of your life.
But you’ll also need to learn new material for defending the faith. You’ll need to learn some facts about science, morality, philosophy, logic, and Biblical hermeneutics. The next book I would recommend is one written by Dr. Norman Geisler and Frank Turek entitled I Don’t Have Enough Faith to be an Atheist. This particular book presents a number of scientific facts, moral topics, and Biblical truths that the apologist should know about.
The third book I would recommend is just a tad bit more rigorous than the previous two. This is where some of the ideas become much more focused. The name of the book is ON GUARD written by Dr. William Lane Craig. Learning the material in this book, and learning it well, will pay significant dividends in future conversations. I have referred to this particular book quite a number of times through the years. I highly recommend it as a starter book for the budding Christian apologist.
I think I’ll have more to say on this topic in the future, but until then, blessings on your journey, and study to show yourself approved!