Bad layouts come from one thing: an acute case of Rushintoititis. Most people want to run trains as soon as possible, and that’s a noble goal, but taking a deep breath and curbing the enthusiasm a little goes a long way toward success. The MR motto is “Dream Plan Build”, not “Build, Plan, Submit Layout design to MR forums and endure loads of well-meant criticism, Dream of finding a different hobby.” There is a reason for that.
Before you do anything else on your layout, you need to nail down a few basics, such as the type of operations you want (continuous running or point to point), amount of switching, size and type of locos and rolling stock (largly determined by the time period you select), number and type of industries, any special scenes, locales, or vignettes you would like to include. All of this must be fairly firm before you can decide if a layout design works for you.
These decisions flow naturally into a more concrete plan, where you may have to make tradeoffs (if you want to run big steam, you can’t use small radius curves, maybe that huge meat packing plant just doesn’t fit, etc.). A rough sketch (by the squares), followed by a more detailed plan is the order of the day. And if you post it here, by all means tell everybody what your preferences are ahead of time, and be prepared to ignore comments that don’t fit your vision (for every design posted, at least one response will tell the OP that he doesn’t really want that kind of layout, he’s just too inexperienced to realize it).
Then, and only then (and maybe long after) should you start cutting benchwork.
The trouble is, true beginners often don’t know what they prefer in terms of operations. To this end, some time with a club actually operating (or at least watching) is very helpful. You can also invest in Trainplayer or similar software which actually lets you run virtual trains,