Gospel Principles Chapter 16: "The Church of Jesus Christ in Former Times"
Our Belief: Christ's Church- This is from Mormon.org. I find it the best place to look on a lot of these topics especially when comparing our church today with the way Christ set it up in His day for these next two lessons really.
"Ask the Missionaries! They Can Help You!" by Elder Russell M. Nelson (Quorum of the 12 Apostles)- Briefly goes over how our church is the same as Christ's church in His day.
"The Doctrine of Christ" by Elder D. Todd Christofferson (of the 12)- How today and in the former times correct doctrine comes through revelation.