In part 10 of Eusebius Ecclesiastical History. We get some practical advice. For example, have you ever wondered:

How would the early church have handled matters of divorce in a situation where after the marriage, one spouse receives Jesus and reforms while the other continues in sin?

Much of this portion of the study contains references to the succession of bishops, and the reputable ancient writers as well as what's in some of those writings. For the complete list see the Full Transcript on my website, which contains links to the resources he mentions.

And then we get a bird's eye view of martyrdoms involving the weakest among Christians. Ten people abdicated their faith bringing great discouragement to the others, but then a demure woman by the name of Blandina took a supernatural beating that shocked and dismayed the men torturing her. Who afterwards confessed they could do nothing to make her die and they were surprised she was still breathing. Revealing that the weakest among Christians who cry out to God with every blow, receive his grace and mercy in their time of need.

For the full series click here: https://www.thebookmatrix.com/2020/01/eusebius-ecclesiastical-hisory.html