I'm meeting this guy from personals dating site?

I'm going out today for the first time with a guy I became aquainted with on yahoo personals. He is several years younger than me and he is very good looking from his photos and I'm just average in looks. He has seen photos of me. He said he was very attracted to my personality and keeps calling me a doll, babe, sweetheart, what have you. Earlier, he kept talking about and I talked dirty with him, but I told him that I couldn't go through with anything that I said and I was just flirting around with him. He said he had diarrhea of the mouth and he was just messing around and he was highly attracted to me and he is tired of being lonely. I have my hesitations about seeing this guy and I haven't been on a date in a couple of years. I told him I would meet him for coffee this evening. What should I say and how should I react to him? I keep thinking in the back of my head he may be a player but yet he sounds nice also. So, what should I do on my first date? I also feel awkard b/c of the age difference and he looks better than me and so automatically I feel at a disadvantage and b/c he is so much younger. Any suggestions?