Finnish guys don't much understand if you flirt with them. We, Finns, are not that flirty people. We like to say things as they are, like I-want-to-go-out-with-you. I find this a bit too no-no. It's too fast, but still I've heard this many times and I almost always answer "yeeees yeeees" (read: "not gonna happen").
Smile is always good. Men like girls who smile. Don't bring up your personality first that much. Just smile. Later you can start showing how bitchy person you might be, but if you want a Finnish guys attention, keep on smiling. You don't even have to talk to him or ask stupid questions like "how are you today" and other stupid small talk. We, Finns, don't do small talk and especially if you ask us "how are you today?" we kind of feel awkward as you can answer this question "good" or "bad" and we don't like to express our feelings this way.
We like to analyze how shit the world is and stuff. Or how drunk we were last night, lost our cell phone, fall a sleep on hallway, vomited while sleeping.. and stuff. So, I prefer you should just smile. That's the best way to flirt to Finnish guy.
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