Start with these:
iradiance-light-probe-hdr-lighting-for-iray-expansion-6
iradiance-light-probe-hdr-lighting-iray-expansion-1
iradiance-light-probe-hdr-lighting-for-iray-expansion-2
Use Dome rotation to get a good base light by going to your:
Render Setting Tab > Environment > Dome Rotation
Change the Dome Rotation (360 degrees) from 1 to 360. Find that sweet spot...

From there add spotlight that point to the character face, body, whatever. You can use the Camera choice option list to view through the Spotlights.

Emissive Lights and Ghost lights is an advance class, lol.
Good Luck!