I am working on a n scale steel mill layout. It currently has a single track main, a 4 track yard with 3 of 4 tracks double ended, a track for the high line, 3 spots for hot metal & slag, and a track to the rolling mill. Most of the tracks are isolated into blocks, and can be used by Cab A or Cab B. Problem is I only have 1 power pack right now. I had a friend come over and I wanted to have an operating night, but I didn't know how to start. I just felt awkward saying " Ok, you be the engineer, and I'll be the conductor / yardmaster, here's what we need to do....", without sounding like a 7 yr old playing "make believe". Any sugestions?