I recently wrote a series of articles for Global 360 on getting started with BPM; since this was paid content, I didn’t publish them here, but it’s available over on bpm.com (to find the whole series, go here and add a title filter of “getting started with bpm”).
These are now being republished on the EndUserSharePoint site, and will be rolled up into an e-book, which you can register to receive when it’s ready.