[UncleDuke]

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How exactly do I calculate my ROI?
I have invested $1100 (11 x 100) and have calculated return of $1290 ((50 x 12) + (30 x 13) + (20 x 15))
So I have a return of $190 on $1100 investment? 17.27% ?

Also what is the best way to keep track of them: month to month, groups of 100 or 1000?

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You've got ROI exactly right.

As to how to group them, I'd say that's personal preference. I mostly just put them all in Poker Tracker (and on my total win/loss spreadsheet) and just have a general idea as to how it's going lately (right now I'm so cold I think drinking myself unconscious before I can play might be +EV) plus the Poker Tracker stats.