atmosphere

Hi, so I have created a scene where a stick man walks along a park street and sits on a bench and all this takes place at night. so far I have done all the modelling etc and now I want to add the right atmosphere to my scene I want it to be quite misty/foggy but not sure of the best way to create that and would like some info on the best way to create that or of any tutorials that would help , I want it to be so it so that the mist is not just in a far but round the character as well.
Thanks in advance for any help

Maybe this tutorial will help?
It seems to be exactly what you’re asking.

Maybe this tutorial will help?
It seems to be exactly what you’re asking.