I want to send some stuff off to america to be signed?

Hi, ive been wanting to send pictures or paper based objects to someone to sign, who lives in america. his address is Toby Turner 12400 Ventura Blvd #276 Studio City, CA 91604 But i dont know how to make it a return mail package already payed because i live in england also, i need to know how much it would cost me aswell thanks.