sure
yes
in order to go a lighter color, you have to have the dye bleached or stripped from your hair, or else you'll just get results of a tiny bit of a brownish tint and that's all, if that.
One will dye your hair blonde and one will dye your hair brown.
Six weeks, unless you want to totally ruin your hair.
with hair dye
yes you can put blond hair dye in dark brown hair
Strip it.
You can dye it with hair products or you can bleach it
Yes.
No, they do not.
You use hair dye... to dye it.
Just dye your hair completely brown. Yes. It should cover it but you should use a darker brown.