A large round brush and volumizing spray. At the crown, with a blowdryer, use a couple spritzes of volumizing spray. You could tease but it works with a roundbrush alone if you use the right volumizing spray, hair spray after to hold it tends to weigh the hair down rather than keep it up.
Or velcro rollers on almost dry hair, at the crown use a light spritz of volumizing spray and a blowdryer.
Then curl the rest with a medium to large sized curling iron.
...the trick with a round brush is to lift the hair at the root upward while blowdrying it, otherwise it wants to lay flat against your head.