How to?

So me and my boyfriend have never really tried sexting. We’ve been together for a year but have been having sex for far longer than that like 4 years almost. I really want to spice things up and try sexting but have no idea how to do it lol. Totally newb here. I especially want to do it while he is at work to tease him and things like that. Any thing y’all could tell me to help me lol.