or you can go straight to the fundamental wisdom of the middle way by JL Garfield. its the translation of mulamadhyamakakarika. on a note letter to a friend is mahayana shastra from what i know and does not really deal with emptiness, more concerned with morality and ethics.
If the thought of demons
Never rises in your mind,
You need not fear the demon hosts around you.
It is most important to tame your mind within....
In so far as the Ultimate, or the true nature of being is concerned,
there are neither buddhas or demons.
He who frees himself from fear and hope, evil and virtue,
will realize the insubstantial and groundless nature of confusion.
Samsara will then appear as the mahamudra itself….