Check out books by Robert Webber such as Evangelicals On the Canterbury Trail and Signs of Wonder an others of his.
Read Thomas Howard's Evangelical Is Not Enough about a BRILLIANT scholar (and C.S. Lewis expert) who came from a fundamentalist Evangelical heritage and made his way into the Anglican and eventually Roman churches.
Peter Gilquist's Becoming Orthodox is about a group of Campus Crusade For Christ Evangelicals who ended up on a journey to Eastern Orthodoxy.
Finally (but in order of importance first), get yourself a copy of The Apostolic Fathers and read the letters written by three men trained and ordained by the Apostles: Ignatius, Polycarp, and Clement. What they have to say is mind blowing. There are a BUNCH of different editions available on Amazon.