Laker 80:
Fortunately, one can place a lot of track in an "L" layout. The L extension is a perfect location for a yard; the switches provide access to stub tracks for "cars in waiting" that can quickly be called into service; the switching maneuvers are part of the fun of creating various consists -- freight, passenger, or unit trains -- without having to gather cars not at rest on the platform for making-up a train. The longer the stub sidings, the better!
Other OGR FORUM hobbyists have already contributed concepts to your emerging layout; I endorse reversing loops, passing sidings for action accessories, and trackage for two-train operation!
My L-shaped layout (a photo derived from ANYRAIL software is attached) has three switched tracks in the yard; dedicated to Lionel THOMAS series trains. They are equipped with LionChief for use by my two great grandsons. Although my layout is bigger than what you are working with, the underlying fundamentals are somewhat similar.
Consider the process of experimenting with track plans a contribution to your education - and your son. Trial and error worked out pretty well for Thomas Edison and other inventors! I learned that lesson after initially re-inventing my original track plan based on Lionel tubular track with O31 curves and switches to Lionel O42 tubular track and switches. A much better plan! If space allowed, I would have used Lionel O48 FasTrak and switches, but the train room wasn't wide enough for that.
Carry on ...
Mike Mottler LCCA 12394
mottlerm@gmail.com