Without knowing which version of Poser you're using, it's hard to give good advice, but there are  tuorials here and on posersoftware dot com that could get you started:

https://www.posersoftware.com/article/584/poser-13-introduction-to-lighting-and-rendering-with-superfly

this is for P13

https://www.posersoftware.com/article/516/poser-12-basics-how-to-control-the-quality-of-your-superfly-renders

this is for Poser 12

https://www.renderosity.com/premium-tutorials/163/poser-pro-11-tutorial-rendering-part-1

https://www.renderosity.com/premium-tutorials/164/poser-pro-11-tutorial-rendering-part-2

these are for poser 11

And, finally, the Poser Manual is rather useful in this regard. Poser 13's Superfly render section start on page  536:

https://www.posersoftware.com/documentation/13/Poser_Documentation.pdf