I've spent a lot of time reading quite a few books, however, I suddenly realize that if I go to a bar, I don't know what to say. I have nothing to say, I don't know them, so how can I know what to say. The routines in Mystery method are quite weird.
How do you manage to tackle this issue? What routines do you use?

I simply introduce myself and tell her straight up that I wanted to talk to her/get to know her. I usually have great intuition if a girl is into me within the first couple of minutes of the meet/conversation, if she is into me I progress gaming and if she isn't I do not waste any more time on her.

Also, "What are you celebrating?" <-Golden!

Just make sure you work on your confidence, the game is as simple as that! Like David D has said, "Attraction is not a choice"

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What makes an average looking guy instantly become “hot”?

This is something AFC Adam does. Go next to her, check your phone for a bit, than laugh tap her on shoulder and say "look at this, crazy right?" and there is your oppener. Calibrate your energy to match hers and go to a DHV story or make her a DHV test...

All this things mean nothing unless you go out there failing again and again and again untill you know what you did wrong.

Or you may go direct and say to her someting like "i saw you and i just wanted to talk to you and say hi".

Go sarge, go fail, go talk! All the books in the world mean nothing if you don't get out and practice. Don't be afraid to fail, we all did and we still do... some more than others.

exactly....as someone said (credit to whoever this was i apologize) the success or failure of the approach are of little matter in comparison to how meaningful the very act of approaching and opening is. Its the fact that you did it that is of the upmost importance, the results are meaningless until you approach enough to no longer have to "force" yourself or psych yourself up

How do you manage to tackle this issue? What routines do you use?

have you heard of openers?

It doesn't matter what you would say, in fact you can say what ever you want or don't say anything at all. what's important is solid eye contact, a good body language and a seductive vibe.

Try going natural and just make an observational comment. Try to be witty, charming, etc. Some girls are stuck up or aren't really trying to talk to random guys, so you'll get the "fuck off" vibe from her. Others are very sociable and friendly and will be willing to engage in whatever type of conversation you bring to them.

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“Nothing is impossible, the word itself says 'I'm possible'!” ~Audrey Hepburn