Meeting someone from Facebook?

I'm meeting a boy from facebook on the weekend and I have no idea what to do/say. shall i turn up early and let him spot me first, or will i look to keen? or on time, both find each other? or late, and i have to look for him? and what do i say when i first go up to him? shall i hug him, umm i generally have no idea what to do aah! help!