Soft tousled Curls. How do I do it?

Dear Billy, I have bone straight hair. How do I get that soft curly look?(An actual question from a client).The look is as classic and beautiful this season as ever. And we'll be seeing more of it, and variations of it as the year goes on. The technique is simple.1. Shampoo and condition as normal2. Towel Dry3. Apply a root lift at the root area4. Apply a body/volumizing serum through to the ends