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I wouldn't worry too much about the start, just start and I think you may find you'll go back to rewrite the opening when you've finished the story. Jump in and see where you end up before worrying about where you start.
Well, that's what I would do, anyway.
How do I do a good first page?
It's a story that takes place on a fictional Earth in the near-ish future. (Probably in the 2020-2030's.) About an assassin of sorts. Filling out contracts on certain targets who reside in a secret society for, of course, money. So he can finally live at least decently instead of either in his worn down apartment or on the streets.
I felt like jumping right into it and starting with some fight or chase scene; or maybe with the assassin just sitting around at first but I'm willing to wager these are almost clichès.