How to flirt with a guy?

Alright so I feel like flirting itself isn't the problem but I struggle with what to say/topics that are good convo starters. For example I want to approach a guy in my local go-to club and he goes there often too. What should I talk about other than work related stuff and so on?

I've never been the super extroverted type and all my romantic partners developed out of friendship. I'd like to change things up a bit and just have more fun without being scared by the small talk.

Thanks in advance <3