re: Poker & excel document
10% would be very good, especially considering the rake. 15% would be crushing, if you could maintain that over 1000 games or so. It's hard to tell what your actual ROI is, even if you have like 200 games finished it could change by 2-3% depending how you do in your next session.
That being said, it's obv going to take a while to get to ~1000 games, or even ~100 games, so in the meantime I would suggest taking time to review your play, if you have any trouble spots post them in Tournament Hand Analysis. It'd also be great for you to introduce yourself and join the other STT players in this thread: http://www.cardschat.com/f59/septemb...thread-182528/
there's a lot of discussion in here about different hands, situations, etc. and you can also post your brags/beats there too.