It just sounds like you got the guide for P90X+ but have the DVD's for P90X. I have heard of that before from people who didn't get it from
www.Beachbody.com
I don't know if we are supposed to flat out tell you which dvd's in which order, but I am pretty sure Lean never does: Chest & Back and Plyometrics.
You might be able to find a guide somewhere as to which to do when, but I am not certain. If you can't find one, just think of which muscle groups each video is doing and altnerate them everyday. As in, if you just did arms, don't do another arms video the next day.