All you can give us is what life is about from your point of view.
Let your human beings follow the music they hear, and let it take them where it will.
In nonfiction, the hope is that the person actually said the words that you have attributed to him or her. In fiction, though, anything goes. It is a matter of ear, just as finding the right physical detail is mostly a matter of eye. You’re not reproducing actual speech—you’re translating the sound and rhythm of what a character says into words. You’re putting down on paper your sense of how the characters speak.
You need to trust that you’ve got it in you to listen to people, watch them, and notice what they wear and how they move, to capture a sense of how they speak.