Where to Begin Reading the Buddha's Teaching?
Begin with the Dhammapada, translated by Acharya Buddharakkhita. It is a solid translation edited by Bhikkhu Bodhi.
Dhammapada is two Pali words, pada meaning "path" and Dhamma meaning "teaching." So Dhammapada means "the path of the teaching." In other words, this book lays out the Buddha's path of wisdom.
The Dhammapada is an anthology of short teachings of the Buddha in 26 chapters. There are nuggets of wisdom in here to encourage, correct, guide, and inspire you on your spiritual journey. This is why it is the best-known and most valued spiritual work of all time.
When you are ready to get serious, begin with the Middle-Length Discourses of the Buddha, also known as the Majjhima Nikāya. The only advice is to read the first chapter last.