Do you mean you want to learn how to make your own mods or how to put different mods in your game? You should read
this helpful information first.
There are several tutorials made by forum members in the VF Mod Forum on how to make mods. They are
here,
here and
here. There are probably others as well. Also read
this post from LadyCFII before installing any mods.
I hope you find this information helpful.