How to style my hair like this, tips?

I suggest using a de-frizzer cream or serum, and also using a heat protectant before using any heat tools on your hair, because if you have wavy hair and you try to straighten it everyday, it will get really damaged. I think it would look pretty if you kept it wavy too, but calm. Also, when your hair is wet, you can blow dry it straight. Good luck, and hope this helps. :)