I recently rummaged through my bookshelf and came up with three books that turns out give a really nice sequence.
Opening the Door to Bon by Nyima Dakota (an overview of the foundational practices for Bon Tibetan Buddhism)
The Awakened One A life of the Buddha by Sherab Chodzin Kohn ( a wonderfully clear representation of the life and awakening of Gautama Buddha)
What makes you 'not' a Buddhist a really serious exploration of the core realization of emptiness.
I hope these books and this podcast help in your practice.
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