what should I do next?

There's this guy that I've known since high school who I see when he comes into my work occasionally. I also happen to see him at his job sometimes and when he spots me he'll wave at me and we'll talk for a bit. Just the other week we exchanged numbers but haven't really texted one another at all. I'm kinda interested in this guy but I don't wanna push things to far/too much, so what should I do?