"Presuppositional apologists claim that there is no neutrality, invoking Jesus’ saying that “one cannot serve two masters” (Matt. 6:24). There can be no compromise between the wisdom of God and the wisdom of the world. Unbelief leads to distortion of the truth, exchanging the truth for a lie (Rom. 1:25). Only by trusting God’s Word can we come to a saving knowledge of Christ (John 5:24, 8:31, 15:3, Rom. 10:17). And trusting entails presupposing: accepting God’s Word as what it is, the foundation of all human knowledge, the ultimate criterion of truth and error (Deut. 18:18-19, 1 Cor. 14:37, Col. 2:2-4, 2 Tim. 3:16-17, 2 Pet. 1:19-21). So the apologetic argument, like all human inquiries into truth, must presuppose the truths of God’s Word." - John Frame from the article " Presuppositional Apologetics," for IVP Dicitonary of Apologetics
"Every Thought Captive: A Study Manual for the Defense of Christian Truth" by Richard Pratt is written for high schoolers, and it's a wonderful introduction to presuppositional apologetics. It's a brief and easy-to- read book, and I would highly recommend it to anyone who desires to share their faith in Christ.
"Apologetics to the Glory of God: An Introduction" by John Frame is also an introduction to presuppositional apologetics, but it is written at a more college/adult-level. I would still recommend Richard Pratt's book over this one, if you have never read anything substantial on apologetics. And if you want something more scholarly on presuppositional apologetics, please refer to John Frame's "The Doctrine of the Knowledge of God", which should be read by every serious teacher of the Bible.