The Imitation of Christ by Thomas á Kempis is a great spiritual book, but also reading the lives of Saints will help such as St Therese of Lisieux or a biography of a patron Saint will do in the beginning stages. Don’t go too deep on a theological level just yet e.g reading the Confessions of Saint Augustine, as it won’t be as easy to comprehend just yet, especially with the use of old English language, it can be a bit confusing !
Hope all goes by Gods Will on your Spiritual Journey ! Praying for you. Stay Strong in prayer