Where would one start in regards to MSBs? I mean, the very beginning - identifying MSBs, etc.

Try www.msb.gov. Also here's the latest joint statement on MSB risk http://www.fdic.gov/news/news/financial/2005/fil2405.html.
The footnote has the BSA definition of MSB. Also try your state's commissioner of financial institutions because it probably regulates local MSBs.