Gil Fronsdal provides a good introduction to the five faculties recommended by the Buddha. He describes each of the faculties and identifies them as skills that we can enhance through practice. You can find his article here: The Five Faculties
A more in-depth examination of confidence and faith can be found in an article that Sharon Salzberg wrote. In the article she examines the difficulty that some people have with the term faith, and the difference between faith as understood in the West and the confirmed confidence and trust that can arise through the practices of meditation, ethical living, and wisdom. You can find her article here: Faith: Its role and Meaning in a Buddhist Wisdom Tradition