Sexting

Sooo, lately I've been trying to think of ways to spice things up with my man. (This app works wonders of course) but I was thinking of sexting?? Unfortunately I never really know how to go about starting it?? Or even really what to say? Lol. I'm such an awkward person and even though I'm 21 and sexually active, with a partner of over a year, talking about sex still makes me giggly and shy. Help??