Answering a question regarding what books to read, Sayyidi wa sanadi Hazrat Moulana Mohammad Taqi Usmani sahib db wrote,
In general all the books authored by scholars from Deoband are beneficial, however, special emphasis should be on reading the mawaiz (lectures) and malfoozat (suhba talks) of Hakeemul-ummat Moulana Ashraf Ali Thanvi ra. In this initial phase limit yourself to them only.

Islahi maktoobat