Oh, and something I forgot: Be sure you have a PC with a decent Nvidia graphics card. That's not an advertising for Nvidia, but if my knowledge is still correct, Daz Studios Iray rendering machine simply does not use AMD-Graphics cards for rendering. That means you would be quite frustrated with rendering times, even if you have fast computer otherwise.

You can use 3Delight, which is another, much simpler, rendering mode in DAZ Studio, but the results are in my opinion far inferior to Iray.