Heh, getting advice from me would be like the blind leading the blind. I've been on enough dates to count on one hand, and that was back in the 80's.
Perhaps, don't think of it too much as a date. More just a meet-up with someone to get to know them better. Don't try to hard to impress. Be yourself.
Hopefully others besides me will also post!
and ... congrats on finding such a great guy.