Erik,
yeah, switches are costly for real railroads also. I thought you may want the option to get going without the total cost. That's why I provided the tracks options.
The key is the start point location on the table. Then you can complete the entire layout and have it all fit.
Transformers are not cheap. The easiest is to use the transformer from the manufacturer of trains that you intend run. Pick one to start. The remote/command operation is also a somewhat costly commitment. A pre-owned Lionel 6-32930 (ZW-C) or an MTH Z-4000 will serve you well and have long term benefits.
The Atlas book has some insights on benchwork, wiring and such, but you can learn a lot searching and reading those topics here. Yes, I do recommend the 3/4" plywood. Long term, you will be glad you did. The homosote is an option, as the roadbed will quiet the already quiet Atlas track.
I also strongly recommend that you locate it as island or floating table for a walk-around. Lots of viewing enjoyment and ease of work and running trains. Claim the real estate now before the better half gets ideas.
if you have a PC, you can download the SCARM software and I'll send you the file.
Enjoy the hobby! Plenty of knowledge and experience here on the OGR Forum. Poke around, make use of it and ask questions.
