Chad, luckily a bunch of those things listed for DCS you don't have to do with Legacy
Example the closet thing you have to use to magic light bulb is a ground plane (or radiator) and that is only in a few very limited situations. And as for start wiring, nope its one wire and enjoy.
As for getting DCS and Legacy to play together Barry has covered that, I guess I could copy Barry's book into the Legacy FAQ's, but I don't think Barry would dig that.
I'll see about jotting some notes in it about Train Link.