I asked out a guy first and got a late response?

I been liking this guy for a while and I see him in the hallways and events frequently, however I don’t know much about him. I’m more attracted for his looks. Today I asked him if he wanted to go out with me and he said yes and he seemed happy as he was smiling and wanted to exchange information. Me and my friends thought he would find me attractive too because we see him staring at me sometimes. However he didn’t text me until 12 hours later.. late at night.
So my question is
What does the late response usually mean?
And do guys like it when a girl asks them out first?
I asked out a guy first and got a late response?
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