First trip with the M4/3 !!! Advice!

Good suggestions so far.  I'll just add real quick that there is a known issue with banding when shooting the E-M5 + 20mm at high ISO (ISO 1600 and above).  For me personally at 1600 it's faint enough (when it happens, which isn't always) that I don't see it unless I try really hard, but 3200 and above it becomes a problem.