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Well Cajun said that you should never show interest in a girl until she shows interest in you
I think this severely limits your game. You can wait around all night and wait for a girl to show interest and go home alone or you can jump in and play the game and see if she wants to play too. A subtle IOI like long eye contact can spark something before you even say a word. In certain situations a strong compliment is very charming and effective. Flirting is an IOI you can start, hell, approaching is an IOI.
Feel free to show interest just don't do it AFC style with flowers, drinks and cheesy lines.