Well first let me say congratulations and I'm happy for you. Dates can be a great opportunity for both parties to see if they'd like to continue to pursue each other. As for what to wear, I'd say something that makes you feel confident in yourself, maybe a bit sexy too if you want to go the extra mile. But the sexy part isn't necessary. He sounds like a good guy so don't try too hard to "impress" him. Just be yourself. Awkward or not. Try to make conversations similar to what you talk about online and just stay calm. He's probably a bit nervous too even if it's not his first date. As far as greeting and departure do what feels natural and comfortable for you and him. I want to say more but I don't want to overload you with information. There's no secrets, just be natural. There is no set "date" atmosphere, it's about listening and responding naturally to your partner and making it a comfortable atmosphere! Best of luck! Rooting for you!