As for the text I’d say The Heart Sutra, Diamond Sutra and Longer Amitabha Sutra. As for resources, I particularly enjoy the commentaries from Thich Nhat Hanh on the first two sutras mentioned and his book “The Heart of the Buddha’s Teachings.” My go-to book for Zen and Pure Land dual practice is called “Buddhism of Wisdom and Faith,” by a Vietnamese master. Another influential figure for me is Chan Master Sheng-Yen. I find him very direct and clear in his explanations.