The Standard Views are fixed as is the location of the ground plane. By default the model axes are located such that the red/green plane lays on the ground plane with solid green running off into the distance in the standard front view. While you can change the axis orientation and location, that has no impact on the Standard Views or ground plane.

First, there are no pages in SketchUp. Create scenes in SketchUp that display what you want to show in LayOut as viewports. When you send the SU file to LayOut, it will open with the last saved scene. Change the viewport to the desired scene in the SketchUp inspector window in LayOut. If you need to change the size, you can drag the edges or corners of the viewport. Note that Shift and Alt impact what happens when you are dragging the edges of the viewport. Play with them to see first hand.

You can set a scale for a viewport if the scene in SketchUp was made with the camera set to Parallel Projection.

Do not open viewports to change the view with Orbit, Pan, or Zoom and do not set the view in the SketchUp inspector window. Doing so will disconnect the viewport from the original scene. Then scene-specific changes you make in SketchUp will not get translated to the LO file.

I think that 'cotation' is used in the sense of 'dimensioning'.
One of those -ion words that doesn't translate well from French !

So, you can do it in Layout.
In SketchUp you'll need a plugin - see this one... http://sketchucation.com/pluginstore?pln=draw_angle_dim