What should I tell him...

So basically theres this guy who goes to the same uni as me but we've never met but I found him on Insta once and thought he was cute so I followed his music account (as his main is priv so felt too forward) and I replied to his story today where he posted a clip of his song saying that's so sick btw (yes I'm English lol) and he was like wow thanks!! And I spoke to my friend who usually has rly good game and she said to ask him something like how long did it take you to write that ?:) So I did and now I'm going to bed but does anyone have any good conversation starters or just something to carry it on because I feel like I'm so shit at this