What happens next?

How to look and act like rosalie hale
Go to the beauty salon, and dye your hair golden blonde, or a light blonde.
In the books, her hair is golden blonde. This is only if you actually want to look like rosalie, not nikki reed.
If your hair is any blonde but dirty blonde, don't get it dyed. If it's dirty blonde, use john frieda blonde go blonder shampoo and conditioner, and the lightening spray.