I have translated the following sentences. please correct me if there are errors.

'весь' means everyone or everything
я говорю за всё = i am speaking for everyone or everything
я говорю всем = i am speaking to everyone or everything

я говорю тебе = im telling to you
я говорю тебя = im telling you (this actually confusing me)

я спрашиваю за все = i am asking for everyone or everything
я спрашиваю всеx = i am asking to everyone or everything

do these following sentences mean anything? or are they nonsense?
я говорю на всё
я спрашиваю на всё
я спрашиваю всеx на столе
я спрашиваю всеx за столoм