how can i get this type of hair style? and what size of curling iron should i use?

also, do you have any products in mind to use? thank yooouu
i couldnt find the link thingy but here is the website… https://www.totalhair.net/hair-styles/gallery-photos/Celebrity-Hairstyles-Women/Carrie-Underwood/1965/hairstyles.html