Good tip on the em1x manual. That's a big difference in page count.You can also download the manual for the Olympus E-M1X as much of what's in it pertains to the E1 Mark II as well. The E-M1X manual is far more detailed than the E-M1 Mark II manual, imho. The Olympus E-M1 Mark II has 218 pages, and E-M1X has 683 pages (A 4 MB file verses a 28 MB file for E-M1X).
Short of that, the Darrell Young book, "Mastering the Olympus OM-D E-M1 Mark II" is good too (but it's still on version 2), and the Olympus E-M1X PDF manual seems to be much like it.
I agree with the above comment on sitting down and trying out various things and practice shooting with them to see if you like them or not.