my suggestion would be to learn how to use the lighting solution that comes with daz before trying reality/lux or octane for rendering. That way you know what it can do and how things can look.The default solution is good for a lot of things one of those is what some would call realistic renders. I’m not sure what kind of “Realistic” you are looking for. A lot of people define this differently, so you may get everything you need out of UE2 that comes with studio 4. I know I have a lot of renders that people consider realistic using that solution.
You need to learn the ins and outs of it’s settings and learn some concepts. I would suggest looking through adamr001 UE posts in the forum.
If you spend some time with UE and find it doesn’t work out for you on it’s own then you can try some of the lighting solutions sold in this store. Once loaded up you can look at them and see how they set up the lights I’ve learned a lot from looking into my favorite lighting sets and trying to mimic them(and simplify them or adjust them other ways)
As already mentioned a good texture is needed as well, I would try rendering a few different textures and comparing the results so you can start learning which textures you have are not as good for realistic rendering as others. Daz’s elite textures tend to be top-teir from my experience. There are some other great ones as well, but there are a lot of ok and mediore ones too. Some skins are better for toon renders! (nothing wrong with that I love toons)
Some people like to use ubersurface and pwsurface to get better control of surfaces. A really good character textures tend to come with a bunch of material setting and maps for specular, displacement and bump and doesn’t need another shader added. Spend some time learning about shaders and materials!
And now that I have mentioned a few products to help out you can see why there isn’t a tutorial that covers it all. It will depend on the tools you use. But you can get a reasonably realistic render just using one UE light and a good character skin. If you want to step up the game then learning other renderers is an option. But I wouldn’t skip to them personally.