Ahhh, I meeting a guy from craigslist tomorrow!!!HELP!?

Ok, so I met this guy from online, I was looking strictly platonic guy friend to exercise with. We are going running tomorrow evening. Uhmm what do I do, the guy describe and pictures was great- funny, cute, interesting. So, yea, I am just going to come off as me.But I am not sure what do if he start liking me?