You would need to use the HDRI maps I believe so try google free HDRI maps if just testing when you see one then you will also realize where they would go in your render setting Environment Map click on the thumb pic and browse to find I just loaded one up for render looked okay you can adjust your time of day etc to suit and if the map does not fall right ie all cloud try the rotate to get the right balance of sun sky. You will need your render set to iRay in your mini viewport few seconds each spin to render preview

Hopefully someone will weigh in and point you in the right direction to obtain some that are set up completely for this system or available from store

Type this into YouTube it might help with other areas with IRay as well

Creating And Lighting A Scene With Iray In DAZ Studio

Not sure of the content but I have viewed a video or two from this user in the past and very good communicator

Hope it helps

- Johnny G

"Try animation to get things moving"

lpr001@renderosity.com