I'm guessing I need to avoid the temptation to go out and buy 3/4" plywood and go with an open grid-style benchwork (correct my terminology please) made of 1"x4" boards about 12" apart, then cutting
3/4" plywood to mount the track. (?)
Brock,
First thing is that you need to try to decide what you want to do. If you just want some trains to run round & round, that will take a different approach than if you want to do intircate switching moves. Usually, most of us settle for something in between.
Second, you need to decide if this is going to be your only layout. I'm on my third one right now. I learned a lot from the first two so you can think of early efforts as learning experiences. As you might guess, you will include skills learned and ideas tested in subsequent projects as you go along.
Third, as to whether or not you want to lay track on 3/4" plywood... that is kind of determined by how many hills / mountains you want in your model. If you were modeling the midwest, you would want to be much more flat than the Rocky Mountains. Even the road that you model won't always determine this... the Union Pacific goes both over the mountains and across the plains; the C&O went through the mountains of Virginia and across the flatlands of Ohio. Decide what you want to do then go from there.
As you have already learned, everyone has an opinion. And, with few exceptions, most all of them are "right" depending on what you want to do. Is a plywood base "right" for you? If you are going to be content to just have a couple of loops of track with some buildings, then probably so. My current layout is built with plywood strips in kind of a gridwork fashion with 1/4" luan plywood on that, topped off with a sheet of 3/4" blue foam insulation. That isn't right for everyone but it suits my needs perfectly.
Finally, and I'll take some real flak here from others: it is YOUR railroad so do what YOU want to do. If you want to haul modern Amtrak passenger cars with old steamers, go for it. It won't be "right" based on what really happened on the railroads, but if it's what you want, do it. If your first building efforts don't look like those that you see in MODEL RAILROADER magazine, don't despair. Keep the building as a measuring stick to judge the improved skills you acquire over time. Take your time, accomplish little things to accomplish the big things and remember that a layout is never done... once you think you are totally done, you will realize that cars may need weathered, buildings may need painted, trees may need improved... this is a lifelong hobby and you will probably have plenty of time to do all of the stuff you want to try. You don't need to do it the first day.
A friend of mine tried model railroading... he went out and bought a very expensive building kit and gave up about a third of the way into it. "Too hard & too expensive..." he says to me. No, he just bit off more than he could chew with that first bite. Start simple but dream big. Most of all, HAVE FUN!
Ask questions here or contact us individually; most of us are willing to share.
dlm