I use spritzes & or mouse that mentions its curl or wave enhancing...usually from the Frizz Ease line by John Freida, but also use others sometimes--you can combine them too if needed. Key is letting your hair dry naturally, you can use the products before or after, but generally work best when applied to damp hair. I usually use the hair dryer on the top part of my hair for volume though.
well when I get out of the shower my hair usually looks like this: link
what I do, after I shower, I sometimes put mousse, but when I don't, I leave it natural and let it air dry and put in herbal essences curl scrunching gel (and it smells really good) and it leaves it looking like that picture, for the whole day :)