You have to think about what to say, how you want to come across, and determine the point of it. Do you want to just chat with that person if you're texting them?
Do you want to solidify plans in the future? If you're thinking about things to text when you just started datingdon't worry. I know my friends and I often chat about what we're saying to our latest crush, but sometimes you need a little kickstarter to get things flowing.