First date tips PLEASE

A guy I've been speaking to has asked me to go for a drink with him and I'm super nervous. I broke up with my ex a while ago and we together for 6 years so I havent been on a real first date ever (my ex and I got together when we were 16, we were in the same friendship group and didn't have much alone time at the start). I can be super shy and I dont want to mess this up by not being able to hold a conversation. I dont know what to wear, what to talk about or anything. Has anyone any tips?