What is the Swing Plane?  It's basically the path the club shaft follows when you swing.
There are a lot of factors that affect your swing plane, including your weight, your height, your posture, your flexibility and your torso.
  You can consider the swing plane somewhat complicated - especially if you are thinking of covering all variations in the plane from address to the end of the follow through.
The plane of your swing is dictated by the shaft's angle at address.
When making a swing with a wedge it's naturally more upright then when making a swing with your driver.
The driver usually has a longer shaft than the wedge and a flatter lie, so in most cases you have stand farther away from the ball.
The easiest way to keep your swing on plane is to have a couple of check points.
Start with the Shaft at 45 degrees to the ground.
At the top, the shaft should be parallel with a line along your heels.
  Impact should look a lot like address, except that the hips are opening to the target.
When your left is "bowed", watch out for a hook.
When your left is "cupped", watch out for a slice.
The Swing sequences usually tend to show three very different methods.
It really doesn't matter what your skill level is, a great way to start improving your golf game is to watch other players play.
You can watch other players that have the same characteristic as you do.