There's a ton of stuff out there on sabermetrics, especially offensive sabermetrics since guys such as James, Palmer, Thorn, etc. started getting into that stuff over 25 years ago. You could find a ton of stuff alone on sites such as Baseball Prospectus, Hardball Times, Retrosheet, etc.
One good site that you may not know about, but could be useful is TangoTiger's site
where he's got a nice collection of essays and research involving sabermetrics.