There are three Church History resources available online to share:
I thought it would be fun to use Twitter to describe Church History events. The very first event of importance is the oldest tweet, and last time I check, no you do not have to sign up for Twitter to read any of it.
This amazon.com link will take you to see a copy of the book I am using as a chronology guide for the Church History Tweets. There is a Volume 2 of this book as well you can search for on your own.
If you want to read the ancient writings of Christians in the past that have survived the persecution and the passing of time, I prepared a list of links in chronological order and set them up on a page that the link above will take you too.