Could someone tell me how, im clueless :(

Thanks in advance

env_fog_controller. Set the distance the fog should start at, and enter a value for far z clipping plane, which is the geek name for "when do I stop rendering anything" ;)

You can then pick the color of the fog (2 different colors) and the intensity, yada yada yada, you've seen that with light_environment and env_sun already :)

also as a suggestion dont use fogblend, it looks terrible.

I can't get my fog to look right. It always goes solid white at the end and all of my tree models and houses look retarded.

I've tried setting the start fade distance higher but I guess I need to lower my model and rendering distance.

Its generally good to set the fog end level pretty far away.

if you're trying to set fog in a skybox too, its settings on the actual sky_camera entity.

I can't get my fog to look right. It always goes solid white at the end and all of my tree models and houses look retarded.

You need to use a sky thats about the same color as the fog color youre using,its the only way you will blend your structures and your skybox.