Common advice for a single guy to meet girls is to have hobbies. I have a couple of hobbies with girls in them, so what do I do to those who I find attractive?

This is a very common recommendation for people, so I would like to ask, what should I do once I’ve met them?

Just for background I’m 24, quite introverted and am in need of work to improve his social skills especially with women.

That said, I have a couple of hobbies where girls are frequent. My main homework for now and until we return from New Year’s break, is to take action to just meet them. I was wondering, what do I do once I’ve done that? I’ve met some cute girls (or at least ones I find attractive) but not sure how to take it further...