[na-adj] + にする [noun] + にする [i-adj 〜い → 〜く] + する
にする after a な-adjective means "make something" that way: you change it on purpose. The thing you change takes を. An い-adjective swaps its final い for く and takes する without に.
When you are changing your own behaviour, there is no を: しずかに静かにする is "be quiet".
After a noun, にする means "decide on", "go with". It is how you order in a shop or a restaurant.
It also means "make into": turning one thing into another.
にする is a change someone makes, and the thing changed takes を. になる is a change that happens by itself, and the thing that changes takes が.