necessary / necessarily / necessity

Hello! Could you help me, please with these words?

As I understood:

"necessarily" - adverb
"necessity" - noun
"necessary" - adjective Could you help me, please with these words.

And the verb "to be" we can use with adjectives and usial verbs with adverbs, e.g.

it is good / I do it well
it is slow / it moves slowly (we can't say "it's slowly", can we?)

So, we can use:

to be necessary (it's necessary to do something);
to do necessarily (I want to go necessarily there);
necessity (different usage)

Please, could tell me if the following sentences are right when we mean that somebody doesn't have to do something?

It's not necessary for him to go there
He is not necessary to go there
It's not necessarily for him to go there
He is not of necessity to go there

Thank you very much!