First, im wondering if you guys always approach girls if you have long eye contact while walking around/chilling at a club . Do you always apply the 3 second rule at clubs? Whats a good opener for someone with whom you had good eyecontact at a club, a "hi" usually worked for me but im looking for something more creative.

"Hi" is a shitty opener 95% of the time unless she is clearly already physically attracted to you. If she isn't, there is no where to go with "hi" other than other bullshit like "how are you?" and "what's your name?"

If you have strong eye contact and want to open, you can decide to either open direct or indirect. After you make the decision, you then go and open using one of those openers. If you don't know any openers, I suggest you read more on this forum then go out. You're going to have to do a bunch of reading bro or your game is going to go nowhere.

Good luck mang

You: "Hi"
Pretend to pluck something out of her hair.
You: "That was bothering me the entire time I was looking at you"
Smile. Pause 2 seconds.
You: "You're even more beautiful now"

Continue regular game, starting with something that negates the last sentences' DLV. Go.

"You're even more beautiful now, too bad you didn't make such an awkward first impression" (smile)

eh?

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Life is too important to be taken seriously. (Church of FSM)

You guys think there's something wrong with a "hi" or a "hello" I dont remember which book i read that said that they arent that bad, prolly jugglers

I think "Hi" is a well opener. Better than most of the long openers learned by heart.
Trust me you won't be rejected because of a "Hi"

I usually go with "hey, you can't look at me like that and not come over and say something" make sure it's slightly playful though.

when I get eye contact I usually try to force an IOI from her by pulling a funny face or doing something else a bit stupid, she'll usually smile or laugh and once you've got that you can pretty much open with anything, even "hi".