Okay, for number one:

If you name the Staves, i.e. You got something like
\new PianoStaff
<<
 \new Staff = "right" { ... }
 \new Staff = "left"{ ... }
>>
You can switch a voice between these staves by
\change Staff = "right"
Also see
http://lilypond.org/doc/v2.19/Documentation/notation/common-notation-for-keyboards#changing-staff-manually[1]
 

Number 2: Use \change Staff = ...

Number 3: 
You can eighter use brackets as discussed here
http://lilypond.1069038.n5.nabble.com/Left-hand-right-hand-editorial-annotation-td161987.html[2]
 

Or you can just add a fingering like rh by 
note-\finger\markup\normal-text”r.h.”.
You can also define your own fingering functions as in
http://petzel.at/rh_lh_fingering.ly[3]

--------
[1] 
http://lilypond.org/doc/v2.19/Documentation/notation/common-notation-for-keyboards#changing-staff-manually
[2] 
http://lilypond.1069038.n5.nabble.com/Left-hand-right-hand-editorial-annotation-td161987.html
[3] http://petzel.at/rh_lh_fingering.ly

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