Please help me with flirting with this girl I like!!!?

Okay so there is this girl that I like and I got her number. We have somethings in common, like we both love baseball and we text about our teams. And when we text we usually just talk about what we are doing. But I really like her and I dont think she knows. I want to start flirting with her (over text) but i dont want to make it obvious. What do I say to her. And I really want to find out if she likes me.