Hello and welcome back to the hobby,
Something to consider…
“A model railroad should probably start with a concept. Why? Because much knowledge about railraoding, experience in model railroading, and thought are required before a proper concept for a model railroad can be formed. These requirements are seldom possible on a first pike. Mine was no exception.”
- -John Allen; Gorre & Daphetid Railroad.
G Paine asked three great questions.
As far a starting with DC and then…
I went that route with my 4’x8’ pike and regretted it.
With DC I had 16 control blocks with over 20 turnouts- -all wired for DC.
Each control block required a single positive feeder wire with a common ground for the entire layout.
Each turnout required three wires for remote operation.
Thats a lot of copper!
On top of that there were the power routing switches (controllers), two cabs (power packs) and the reversing circuit for the Wye.
When I converted to DCC I removed most of the wires to the control districts.
I went from 16 control districts to 4 pairs of feeder wires from a terminal strip connected to the booster.
For the Wye I installed an Auto Reversing Unit that changes polarity automatically- -no more having to “think” about manually flipping a switch to avoid a short.
I kept all the turnouts DC.
The money I spent on controllers, cabs and wire could have easily paid for at least half of any good DCC system.
As has been said many times, “With DC you run the track, with DCC you run the trains.”
Hope this helps.