There is no such thing as a standard switching layout. Switching simply refers to the process of rearranging cars in a train, or picking up and dropping off.
If you look at the stick thread called "A collection of track plans" you will find a few. The hobby press has numerous examples of them.
Basically, though, keep the following points in mind:
1) you need at least one area where the loco can run around the train, especially if you have a lot of dead-end spurs, because you CAN'T pull cars into those (unless you expect the loco to just sit there while the cars are loaded, something real railroads rarely do).
2) Have a couple of free tracks or sections of track where cars can be cut off temporarily so that you can drop the end of a train there, spot some empties out of the middle of the train, then pick up the rest of your train again.
3) If your trains include cabooses, where will you park them while you drop off or pick up cars.
4) If you have any switchback moves, make sure the tail track on your turnout is long enough for at least the loco and one car (it's tedious to spot several cars through a switchback that short, but it can be done).
5) be aware of your fouling points. If cars are left on a diverging leg of a turnout, you have to be able to be able to push them far enough past the frog that they won't interfere with cars passing on the other leg.
Connecticut Valley Railroad -- A Branch of the New York, New Haven, And Hartford
"We don't stop playing because we grow old. We grow old because we stop playing." --George Bernard Shaw