Recommended for purchase:
Everett Ferguson. Early Christians Speak: Faith and Life in the First Three Centuries.Volume 1 (1997) | Volume 2 (2002) What did the earliest church fathers say about baptism, the Lord's Supper, church music, and other topics? Ferguson is a top scholar in early church history.
Everett Ferguson. Inheriting Wisdom: Readings for Today from Ancient Christian Writers (2004)
Philip Schaff. History of the Christian Church, 8 vols. (orig. publ. c. 1910; reprint: 1985). This is one of the best classic works on church history and the Church Fathers, and at an outstanding price!