This may seem like an obtuse observation, but I think it was, or is, a really good idea to get trains running right away. That makes the layout fun right away. The rest is gravy. Too many guys get lost or buried with complicated schemes. Simple elegance, for me, is the essence of standard gauge. And the standard by which I gauge my life.
Ok, that last line was stretching it a tad. Have fun. Cheers!