Re: Printing advice
I would put it all on one staff, with a system break at each key change. Place a system break by highlighting the appropriate barline, press <Alt+Enter> to get to the properties dialogue then press <Alt+F> or click in the system break checkbox (on the "bar" tab)
Multiple staves are intended for multiple instruments, not trying to make a page layout. The NWC editor is not WYSIWYG.
When you print it the staves will wrap when the page width has been reached - you can force it earlier by using the forced system break as described above. To see what the layout will look like, use print preview.