How/when do you flirt?

Hello people of ARAD, I’m 21 years old and autistic, which for me means I have a hard time learning social skills. While I have no problem talking to people who I already know, I somewhat struggle when talking to new people, especially with what to talk about.

However, whenever I talk with someone I find attractive and I actually succeed in having a nice conversation, I never manage to do anything but just have a friendly chat, no flirting or anything of the sorts, and whenever I pick up on something that I think might be flirty, I overthink too much and fumble it.

Do any of you have any advice or tips on how I could improve? Thanks in advance.