Don't try to flirt. Just talk to people. Trying to flirt often comes off as creepy. It's all just confidence. The stutter can actually work in your favour. I think it's actually very disarming especially in a night club or pub setting where women always have some dude trying some shitty line. I'm happily married now but when I was younger I'd talk to alot of women when I was out. Girls like a dude who's confident enough to just walk up and say "Hi how's your night going?" Also of you want to compliment someone. Compliment something they chose, not something they can't help. Talk about their outfit or their hair style not their physical appearance. It's less creepy and a conversation starter.