I asked a guy out and he said yes, now what?

I didn’t think things through and was focused on building the courage to ask him out that I didn’t even consider what to say or do if he said yes. Im in my mid twenties and I’ve never asked anyone out or been on a date because I’m terribly shy and socially awkward. It takes me a long time to feel comfortable around new people and open up to them. He also seems to be more of a quiet introvert so I’m already overthinking how quiet and awkward it would get hanging out. I asked him over text and it took him over a day to respond so I’m thinking he just said yes out of pity? I felt physically sick the first few hours waiting for a response, I can’t imagine what it’ll be like actually hanging out with him. I know not to take things too seriously and not to expect much, if anything this is practice for possible future dates but I can’t stop overthinking of all that could go wrong, any tips?