You are trying to put the proverbial cart before the horse.
You need to list your “givens and Druthers”
First you have to know your space limitations, including any obstacles or need for pits or liftouts. This would be a “given”
Then you have to know what you want a layout to DO. {Operations, switching, round and round, scenic, tourist, coal mining, engine servicing, yard switching, point to point, etc}} This would be a “druthers”
You also SHOULD pick a time period {era} as shorter cars ran once and can tolerate tighter curves, some longer steamers ran once requiring larger radii curves, and more modern diesel locos will require larger radius curves over shorter older diesels who can negotiate tighter curves! Your ability to run various equipment WILL be administered to by the tighteness of your curves!! {18"R, 22"R, 30"R curves, etc}
Then you have to plan what will work the two {and more} together.
Go to the right side margin and find the “search our community” feature and search for “givens and druthers” under Model Railroader forums and you should get threads where guys had thoroughly spelled out a list of givens and druthers to aid us in helping to design a layout.
There will be no “stock plan” exactly for a layout to meet your wishes{ unless you want a standard 4x8 or so} and so you will have to craft one. Its nto as easy as “gimme a track plan please”. Ideas can be offered, but…
SO look up givens and druthers, write yours down, make a map of your space,and get back to us about a plan we can really honestly help you with.
[8-|]