How do I flirt?

Ok so I’ve really only had one other boyfriend besides this new one I have now and the last boyfriend I had was like my friend so we didn’t do anything like flirt or stuff and now I have this new guy and I like him a lot and he likes to do that and so do I. Well how do I like flirt or like mess with him? I want to be able to get under his skin in a good way. Like in public or while it’s just us. And we aren’t at the point where we want to have sex so like any ways that I can get to him that doesn’t involve that. And yes he also agrees that we aren’t ready for sex so it’s ok he’s good with it. But I just need help. I’m new to this and need advice.