Setting up back to back serial WAN

I’m studying for the CCNA, and I have bought 3 routers, a 1604, 2501 & 2503. I would like to set up Frame Relay on the 2501 & 2503 and I have a DTE/DCE serial cable.

Does anyone know where some documentation is that will be helpful in setting up back to back Frame Relay? I do have a CCNA study guide but there is not any examples on how to do this.

Thanks in advance!