After 3 days of searching online for answers of how to do volumatrics in Unreal/Octane I have found squat.
Since there is no support i'm switching to Octane with Blender.
Later.

Ok I found a reasonable tutorial, this guy talks about octanerendertargetactor (details) sub selection 'environment' and a parameter called medium.
https://www.youtube.com/watch?v=vRq5hvaD72g&t=9s
I assume this is where I need to be, are there other methods ?

Just got with the program but dont understand how to do volumetric fog and god ray stuff, where do I start, should I use niagara ?
Thanks.