... please

I want to play Rachmaninoff Op16 No3. I love this piece and from listening to / reading the music I think it is assessible with a little preparation.
Could you recommend any pieces that might be useful as preparation? Im looking through the Mendellsohn "Songs... " to begin with.
Also, anything I should be aware of before starting this piece?
Chord wise, I can manage most of them. Pity all the ruff ones are in the RH though

Cheers!
SJ