piano template key signature and transpose

[onix]

I am using lilypond 2.1.0

I need to transpose piano music I am playing tomorrow morning.
I took the sheet music and entered them into a lilypond
document using the template below as a guide:

http://lilypond.org/doc/v2.0/input/template/out-www/lily-1019401220.ly

1) Where do I insert the key signature command "\key bes \major"?
2) Where do I insert the transpose command "\transpose bes g"?
3) If my time signature were different, where would I insert it?
4) How do I limit this to 4 measures per line?

These questions are in the order of importance.  I have used lilypond
previously using the docs to make instrument parts and scores, but this
is my first attempt at polyphony (piano music).

Dave